{ "instance": { "prld-10k_20211231.htm": { "axisCustom": 0, "axisStandard": 22, "contextCount": 133, "dts": { "calculationLink": { "local": [ "prld-20211231_cal.xml" ] }, "definitionLink": { "local": [ "prld-20211231_def.xml" ] }, "inline": { "local": [ "prld-10k_20211231.htm" ] }, "labelLink": { "local": [ "prld-20211231_lab.xml" ] }, "presentationLink": { "local": [ "prld-20211231_pre.xml" ] }, "schema": { "local": [ "prld-20211231.xsd" ], "remote": [ "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd", "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd", "http://www.xbrl.org/2003/xl-2003-12-31.xsd", "http://www.xbrl.org/2003/xlink-2003-12-31.xsd", "http://www.xbrl.org/2005/xbrldt-2005.xsd", "http://www.xbrl.org/2006/ref-2006-02-27.xsd", "http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd", "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd", "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd", "https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd", "https://xbrl.fasb.org/srt/2021/elts/srt-roles-2021-01-31.xsd", "https://xbrl.fasb.org/srt/2021/elts/srt-types-2021-01-31.xsd", "https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd", "https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd", "https://xbrl.fasb.org/us-gaap/2021/elts/us-types-2021-01-31.xsd", "https://xbrl.sec.gov/country/2021/country-2021.xsd", "https://xbrl.sec.gov/currency/2021/currency-2021.xsd", "https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd", "https://xbrl.sec.gov/exch/2021/exch-2021.xsd", "https://xbrl.sec.gov/naics/2021/naics-2021.xsd", "https://xbrl.sec.gov/sic/2021/sic-2021.xsd", "https://xbrl.sec.gov/stpr/2021/stpr-2021.xsd" ] } }, "elementCount": 452, "entityCount": 1, "hidden": { "http://fasb.org/us-gaap/2021-01-31": 26, "http://preludetx.com/20211231": 2, "http://xbrl.sec.gov/dei/2021q4": 4, "total": 32 }, "keyCustom": 44, "keyStandard": 342, "memberCustom": 16, "memberStandard": 30, "nsprefix": "prld", "nsuri": "http://preludetx.com/20211231", "report": { "R1": { "firstAnchor": { "ancestors": [ "p", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "dei:DocumentType", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "document", "isDefault": "true", "longName": "100000 - Document - Document and Entity Information", "role": "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation", "shortName": "Document and Entity Information", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "dei:DocumentType", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R10": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100090 - Disclosure - Summary of Significant Accounting Policies", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies", "shortName": "Summary of Significant Accounting Policies", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R11": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100100 - Disclosure - Marketable Securities", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecurities", "shortName": "Marketable Securities", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R12": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100110 - Disclosure - Fair Value of Financial Instruments", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstruments", "shortName": "Fair Value of Financial Instruments", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R13": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100120 - Disclosure - Property and Equipment", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipment", "shortName": "Property and Equipment", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R14": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "prld:AccruedExpensesAndOtherCurrentLiabilitiesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100130 - Disclosure - Accrued Expenses and Other Current Liabilities", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilities", "shortName": "Accrued Expenses and Other Current Liabilities", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "prld:AccruedExpensesAndOtherCurrentLiabilitiesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R15": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100140 - Disclosure - Commitments", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitments", "shortName": "Commitments", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R16": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100150 - Disclosure - Convertible Preferred Stock and Common Stock", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStock", "shortName": "Convertible Preferred Stock and Common Stock", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R17": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100160 - Disclosure - Stock-Based Compensation", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensation", "shortName": "Stock-Based Compensation", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R18": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100170 - Disclosure - Income Taxes", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxes", "shortName": "Income Taxes", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R19": { "firstAnchor": { "ancestors": [ "us-gaap:SignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100180 - Disclosure - Summary of Significant Accounting Policies (Policies)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies", "shortName": "Summary of Significant Accounting Policies (Policies)", "subGroupType": "policies", "uniqueAnchor": { "ancestors": [ "us-gaap:SignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R2": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100010 - Statement - BALANCE SHEETS", "role": "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS", "shortName": "BALANCE SHEETS", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "lang": null, "name": "us-gaap:MarketableSecuritiesCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R20": { "firstAnchor": { "ancestors": [ "us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy", "us-gaap:SignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100190 - Disclosure - Summary of Significant Accounting Policies (Tables)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables", "shortName": "Summary of Significant Accounting Policies (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy", "us-gaap:SignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R21": { "firstAnchor": { "ancestors": [ "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:MarketableSecuritiesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100200 - Disclosure - Marketable Securities (Tables)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesTables", "shortName": "Marketable Securities (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:MarketableSecuritiesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R22": { "firstAnchor": { "ancestors": [ "us-gaap:FairValueDisclosuresTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100210 - Disclosure - Fair Value of Financial Instruments (Tables)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsTables", "shortName": "Fair Value of Financial Instruments (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:FairValueDisclosuresTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R23": { "firstAnchor": { "ancestors": [ "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100220 - Disclosure - Property and Equipment (Tables)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentTables", "shortName": "Property and Equipment (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R24": { "firstAnchor": { "ancestors": [ "prld:AccruedExpensesAndOtherCurrentLiabilitiesTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "prld:ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100230 - Disclosure - Accrued Expenses and Other Current Liabilities (Tables)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables", "shortName": "Accrued Expenses and Other Current Liabilities (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "prld:AccruedExpensesAndOtherCurrentLiabilitiesTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "prld:ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R25": { "firstAnchor": { "ancestors": [ "us-gaap:CommitmentsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapLeaseContractualTermAxis_prldOperatingLeaseExpiringDecember2022Member_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100240 - Disclosure - Commitments (Tables)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsTables", "shortName": "Commitments (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:CommitmentsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapLeaseContractualTermAxis_prldOperatingLeaseExpiringDecember2022Member_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R26": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100250 - Disclosure - Stock-Based Compensation (Tables)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationTables", "shortName": "Stock-Based Compensation (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R27": { "firstAnchor": { "ancestors": [ "us-gaap:IncomeTaxDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100260 - Disclosure - Income Taxes (Tables)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesTables", "shortName": "Income Taxes (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:IncomeTaxDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R28": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:RetainedEarningsAccumulatedDeficit", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100270 - Disclosure - Risks and Liquidity - Additional Information (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureRisksAndLiquidityAdditionalInformationDetails", "shortName": "Risks and Liquidity - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R29": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100280 - Disclosure - Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfReconciliationOfCashAndCashEquivalentsAndRestrictedCashDetails", "shortName": "Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock", "us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy", "us-gaap:SignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "lang": null, "name": "us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R3": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapStatementClassOfStockAxis_prldVotingCommonStockMember_20211231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:CommonStockParOrStatedValuePerShare", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100020 - Statement - BALANCE SHEETS (PARENTHETICAL)", "role": "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL", "shortName": "BALANCE SHEETS (PARENTHETICAL)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapStatementClassOfStockAxis_prldVotingCommonStockMember_20211231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:CommonStockParOrStatedValuePerShare", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" } }, "R30": { "firstAnchor": { "ancestors": [ "p", "prld:PropertyPlantAndEquipmentUsefulLifeTableTextBlock", "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentDepreciationMethods", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100290 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails", "shortName": "Summary of Significant Accounting Policies - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "prld:PropertyPlantAndEquipmentUsefulLifeTableTextBlock", "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentDepreciationMethods", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R31": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "prld:PropertyPlantAndEquipmentUsefulLifeTableTextBlock", "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapPropertyPlantAndEquipmentByTypeAxis_us-gaapEquipmentMember_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentUsefulLife", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100300 - Disclosure - Summary of Significant Accounting Policies - Schedule of Property Plant and Equipment Useful Life (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentUsefulLifeDetails", "shortName": "Summary of Significant Accounting Policies - Schedule of Property Plant and Equipment Useful Life (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "prld:PropertyPlantAndEquipmentUsefulLifeTableTextBlock", "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapPropertyPlantAndEquipmentByTypeAxis_us-gaapEquipmentMember_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentUsefulLife", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R32": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "0", "first": true, "lang": null, "name": "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100310 - Disclosure - Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-average Shares of Common Stock Outstanding (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesOfCommonStockOutstandingDetails", "shortName": "Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-average Shares of Common Stock Outstanding (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "0", "first": true, "lang": null, "name": "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R33": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:MarketableSecuritiesTextBlock", "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100320 - Disclosure - Marketable Securities - Schedule of Marketable Securities (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails", "shortName": "Marketable Securities - Schedule of Marketable Securities (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:MarketableSecuritiesTextBlock", "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R34": { "firstAnchor": { "ancestors": [ "span", "p", "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions", "reportCount": 1, "unique": true, "unitRef": "U_prldSecurity", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100330 - Disclosure - Marketable Securities - Additional Information (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesAdditionalInformationDetails", "shortName": "Marketable Securities - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "p", "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions", "reportCount": 1, "unique": true, "unitRef": "U_prldSecurity", "xsiNil": "false" } }, "R35": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "us-gaap:FairValueDisclosuresTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel1Member_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100340 - Disclosure - Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "shortName": "Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "us-gaap:FairValueDisclosuresTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel1Member_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R36": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:PropertyPlantAndEquipmentTextBlock", "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:PropertyPlantAndEquipmentGross", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100350 - Disclosure - Property and Equipment - Schedule of Property and Equipment (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails", "shortName": "Property and Equipment - Schedule of Property and Equipment (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:PropertyPlantAndEquipmentTextBlock", "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:PropertyPlantAndEquipmentGross", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R37": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapPropertyPlantAndEquipmentByTypeAxis_us-gaapEquipmentMember_20190901_20190930", "decimals": null, "first": true, "lang": "en-US", "name": "prld:CapitalLeaseTerm", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100360 - Disclosure - Property and Equipment - Additional Information (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails", "shortName": "Property and Equipment - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapPropertyPlantAndEquipmentByTypeAxis_us-gaapEquipmentMember_20190901_20190930", "decimals": null, "first": true, "lang": "en-US", "name": "prld:CapitalLeaseTerm", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R38": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "prld:ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock", "prld:AccruedExpensesAndOtherCurrentLiabilitiesTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:EmployeeRelatedLiabilitiesCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100370 - Disclosure - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails", "shortName": "Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "prld:ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock", "prld:AccruedExpensesAndOtherCurrentLiabilitiesTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:EmployeeRelatedLiabilitiesCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R39": { "firstAnchor": { "ancestors": [ "p", "us-gaap:CommitmentsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeaseOptionToExtend", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100380 - Disclosure - Commitments - Additional Information (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "shortName": "Commitments - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:CommitmentsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LesseeOperatingLeaseOptionToExtend", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R4": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ResearchAndDevelopmentExpense", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100030 - Statement - STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS", "role": "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS", "shortName": "STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "-3", "lang": null, "name": "us-gaap:GeneralAndAdministrativeExpense", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R40": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OperatingLeaseLiabilityCurrent", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100390 - Disclosure - Commitments - Schedule of Future Minimum Lease Payments Under Lease (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails", "shortName": "Commitments - Schedule of Future Minimum Lease Payments Under Lease (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "us-gaap:CommitmentsDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapLeaseContractualTermAxis_prldOperatingLeaseExpiringDecember2022Member_20211231", "decimals": "-3", "lang": null, "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R41": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20200101_20201231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProceedsFromIssuanceInitialPublicOffering", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100410 - Disclosure - Convertible Preferred Stock and Common Stock - Additional Information (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "shortName": "Convertible Preferred Stock and Common Stock - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapStatementEquityComponentsAxis_us-gaapCommonStockMember_20210101_20211231", "decimals": null, "lang": "en-US", "name": "us-gaap:CommonStockVotingRights", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R42": { "firstAnchor": { "ancestors": [ "p", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "INF", "first": true, "lang": null, "name": "prld:NumberOfEquityIncentivePlans", "reportCount": 1, "unique": true, "unitRef": "U_prldPlan", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100420 - Disclosure - Stock-Based Compensation - Additional Information (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "shortName": "Stock-Based Compensation - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "INF", "first": true, "lang": null, "name": "prld:NumberOfEquityIncentivePlans", "reportCount": 1, "unique": true, "unitRef": "U_prldPlan", "xsiNil": "false" } }, "R43": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AllocatedShareBasedCompensationExpense", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100430 - Disclosure - Stock-Based Compensation - Schedule of Stock-Based Compensation Expense Recorded in Statements of Operations (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseRecordedInStatementsOfOperationsDetails", "shortName": "Stock-Based Compensation - Schedule of Stock-Based Compensation Expense Recorded in Statements of Operations (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapIncomeStatementLocationAxis_us-gaapResearchAndDevelopmentExpenseMember_20210101_20211231", "decimals": "-3", "lang": null, "name": "us-gaap:AllocatedShareBasedCompensationExpense", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R44": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20201231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber", "reportCount": 1, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100440 - Disclosure - Stock-Based Compensation - Summary of Stock Option Activity (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails", "shortName": "Stock-Based Compensation - Summary of Stock Option Activity (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "INF", "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R45": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100450 - Disclosure - Stock-Based Compensation - Summary of Information about Stock Options Outstanding (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails", "shortName": "Stock-Based Compensation - Summary of Information about Stock Options Outstanding (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R46": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapAwardTypeAxis_us-gaapEmployeeStockOptionMember_20210101_20211231", "decimals": "4", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100460 - Disclosure - Stock-Based Compensation - Schedule of Fair Value of Each Option Estimated on Date of Grant Using Weighted Average Assumptions (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails", "shortName": "Stock-Based Compensation - Schedule of Fair Value of Each Option Estimated on Date of Grant Using Weighted Average Assumptions (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapAwardTypeAxis_us-gaapEmployeeStockOptionMember_20210101_20211231", "decimals": "4", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R47": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:NonvestedRestrictedStockSharesActivityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapAwardTypeAxis_us-gaapRestrictedStockMember_20201231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber", "reportCount": 1, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100470 - Disclosure - Stock-Based Compensation - Summary of Activity related to RSA Stock-Based Payment Awards (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "shortName": "Stock-Based Compensation - Summary of Activity related to RSA Stock-Based Payment Awards (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:NonvestedRestrictedStockSharesActivityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapAwardTypeAxis_us-gaapRestrictedStockMember_20191231", "decimals": "INF", "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R48": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapAwardTypeAxis_us-gaapRestrictedStockUnitsRSUMember_20210101_20211231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100480 - Disclosure - Stock-Based Compensation - Summary of Activity related to RSU Stock-Based Payment Awards (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails", "shortName": "Stock-Based Compensation - Summary of Activity related to RSU Stock-Based Payment Awards (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapAwardTypeAxis_us-gaapRestrictedStockUnitsRSUMember_20210101_20211231", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R49": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock", "us-gaap:IncomeTaxDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DeferredTaxAssetsOperatingLossCarryforwards", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100490 - Disclosure - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails", "shortName": "Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock", "us-gaap:IncomeTaxDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "lang": null, "name": "us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R5": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapStatementClassOfStockAxis_prldSeriesAConvertiblePreferredStockMember_20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:TemporaryEquityCarryingAmountAttributableToParent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100040 - Statement - STATEMENTS OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)", "role": "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT", "shortName": "STATEMENTS OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapStatementClassOfStockAxis_prldSeriesAConvertiblePreferredStockMember_20191231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:TemporaryEquityCarryingAmountAttributableToParent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R50": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100500 - Disclosure - Income Taxes - Additional Information (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails", "shortName": "Income Taxes - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:ValuationAllowanceDeferredTaxAssetChangeInAmount", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R51": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "3", "first": true, "lang": null, "name": "us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100510 - Disclosure - Income Taxes - Schedule of Reconciliation of the Federal Income tax Rate to Effective Tax Rate (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails", "shortName": "Income Taxes - Schedule of Reconciliation of the Federal Income tax Rate to Effective Tax Rate (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "3", "first": true, "lang": null, "name": "us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R52": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock", "us-gaap:IncomeTaxDisclosureTextBlock", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:DeferredTaxAssetsOperatingLossCarryforwards", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100520 - Disclosure - Income Taxes - Schedule of Federal and State Net Operating Losses and Research Tax Credits (Details)", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfFederalAndStateNetOperatingLossesAndResearchTaxCreditsDetails", "shortName": "Income Taxes - Schedule of Federal and State Net Operating Losses and Research Tax Credits (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "prld:ScheduleOfFederalStateAndLocalNetOperatingLossesAndResearchTaxCreditsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_us-gaapIncomeTaxAuthorityAxis_us-gaapDomesticCountryMember_20211231", "decimals": "-3", "lang": null, "name": "us-gaap:DeferredTaxAssetsOperatingLossCarryforwards", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R6": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "-3", "first": true, "lang": null, "name": "prld:PaymentsOfOfferingCosts", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100050 - Statement - STATEMENTS OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (PARENTHETICAL)", "role": "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICITPARENTHETICAL", "shortName": "STATEMENTS OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (PARENTHETICAL)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "-3", "first": true, "lang": null, "name": "prld:PaymentsOfOfferingCosts", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R7": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100060 - Statement - STATEMENTS OF CASH FLOWS", "role": "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS", "shortName": "STATEMENTS OF CASH FLOWS", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R8": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:NatureOfOperations", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100070 - Disclosure - Nature of Operations", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureNatureOfOperations", "shortName": "Nature of Operations", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:NatureOfOperations", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R9": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "prld:RisksAndLiquidityTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100080 - Disclosure - Risks and Liquidity", "role": "http://preludetx.com/20211231/taxonomy/role/DisclosureRisksAndLiquidity", "shortName": "Risks and Liquidity", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "prld-10k_20211231.htm", "contextRef": "C_0001678660_20210101_20211231", "decimals": null, "first": true, "lang": "en-US", "name": "prld:RisksAndLiquidityTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } } }, "segmentCount": 50, "tag": { "dei_AmendmentFlag": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.", "label": "Amendment Flag", "terseLabel": "Amendment Flag" } } }, "localname": "AmendmentFlag", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_AuditorFirmId": { "auth_ref": [ "r472", "r473", "r474" ], "lang": { "en-us": { "role": { "documentation": "PCAOB issued Audit Firm Identifier", "label": "Auditor Firm Id", "terseLabel": "Auditor Firm ID" } } }, "localname": "AuditorFirmId", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "nonemptySequenceNumberItemType" }, "dei_AuditorLocation": { "auth_ref": [ "r472", "r473", "r474" ], "lang": { "en-us": { "role": { "label": "Auditor Location", "terseLabel": "Auditor Location" } } }, "localname": "AuditorLocation", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "internationalNameItemType" }, "dei_AuditorName": { "auth_ref": [ "r472", "r473", "r474" ], "lang": { "en-us": { "role": { "label": "Auditor Name", "terseLabel": "Auditor Name" } } }, "localname": "AuditorName", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "internationalNameItemType" }, "dei_CityAreaCode": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Area code of city", "label": "City Area Code", "terseLabel": "City Area Code" } } }, "localname": "CityAreaCode", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_CurrentFiscalYearEndDate": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "End date of current fiscal year in the format --MM-DD.", "label": "Current Fiscal Year End Date", "terseLabel": "Current Fiscal Year End Date" } } }, "localname": "CurrentFiscalYearEndDate", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "gMonthDayItemType" }, "dei_DocumentAnnualReport": { "auth_ref": [ "r472", "r473", "r474" ], "lang": { "en-us": { "role": { "documentation": "Boolean flag that is true only for a form used as an annual report.", "label": "Document Annual Report", "terseLabel": "Document Annual Report" } } }, "localname": "DocumentAnnualReport", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_DocumentFiscalPeriodFocus": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Fiscal period values are FY, Q1, Q2, and Q3. 1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.", "label": "Document Fiscal Period Focus", "terseLabel": "Document Fiscal Period Focus" } } }, "localname": "DocumentFiscalPeriodFocus", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "fiscalPeriodItemType" }, "dei_DocumentFiscalYearFocus": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "This is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.", "label": "Document Fiscal Year Focus", "terseLabel": "Document Fiscal Year Focus" } } }, "localname": "DocumentFiscalYearFocus", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "gYearItemType" }, "dei_DocumentPeriodEndDate": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.", "label": "Document Period End Date", "terseLabel": "Document Period End Date" } } }, "localname": "DocumentPeriodEndDate", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "dateItemType" }, "dei_DocumentTransitionReport": { "auth_ref": [ "r475" ], "lang": { "en-us": { "role": { "documentation": "Boolean flag that is true only for a form used as a transition report.", "label": "Document Transition Report", "terseLabel": "Document Transition Report" } } }, "localname": "DocumentTransitionReport", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_DocumentType": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.", "label": "Document Type", "terseLabel": "Document Type" } } }, "localname": "DocumentType", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "submissionTypeItemType" }, "dei_DocumentsIncorporatedByReferenceTextBlock": { "auth_ref": [ "r470" ], "lang": { "en-us": { "role": { "documentation": "Documents incorporated by reference.", "label": "Documents Incorporated By Reference [Text Block]", "terseLabel": "Documents Incorporated by Reference" } } }, "localname": "DocumentsIncorporatedByReferenceTextBlock", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "textBlockItemType" }, "dei_EntityAddressAddressLine1": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Address Line 1 such as Attn, Building Name, Street Name", "label": "Entity Address Address Line1", "terseLabel": "Entity Address, Address Line One" } } }, "localname": "EntityAddressAddressLine1", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressCityOrTown": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Name of the City or Town", "label": "Entity Address City Or Town", "terseLabel": "Entity Address, City or Town" } } }, "localname": "EntityAddressCityOrTown", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressPostalZipCode": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Code for the postal or zip code", "label": "Entity Address Postal Zip Code", "terseLabel": "Entity Address, Postal Zip Code" } } }, "localname": "EntityAddressPostalZipCode", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressStateOrProvince": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Name of the state or province.", "label": "Entity Address State Or Province", "terseLabel": "Entity Address, State or Province" } } }, "localname": "EntityAddressStateOrProvince", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "stateOrProvinceItemType" }, "dei_EntityCentralIndexKey": { "auth_ref": [ "r469" ], "lang": { "en-us": { "role": { "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.", "label": "Entity Central Index Key", "terseLabel": "Entity Central Index Key" } } }, "localname": "EntityCentralIndexKey", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "centralIndexKeyItemType" }, "dei_EntityCommonStockSharesOutstanding": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.", "label": "Entity Common Stock Shares Outstanding", "verboseLabel": "Entity Common Stock, Shares Outstanding" } } }, "localname": "EntityCommonStockSharesOutstanding", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "sharesItemType" }, "dei_EntityCurrentReportingStatus": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.", "label": "Entity Current Reporting Status", "terseLabel": "Entity Current Reporting Status" } } }, "localname": "EntityCurrentReportingStatus", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityEmergingGrowthCompany": { "auth_ref": [ "r469" ], "lang": { "en-us": { "role": { "documentation": "Indicate if registrant meets the emerging growth company criteria.", "label": "Entity Emerging Growth Company", "terseLabel": "Entity Emerging Growth Company" } } }, "localname": "EntityEmergingGrowthCompany", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityExTransitionPeriod": { "auth_ref": [ "r480" ], "lang": { "en-us": { "role": { "documentation": "Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.", "label": "Entity Ex Transition Period", "terseLabel": "Entity Ex Transition Period" } } }, "localname": "EntityExTransitionPeriod", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityFileNumber": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.", "label": "Entity File Number", "terseLabel": "Entity File Number" } } }, "localname": "EntityFileNumber", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "fileNumberItemType" }, "dei_EntityFilerCategory": { "auth_ref": [ "r469" ], "lang": { "en-us": { "role": { "documentation": "Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.", "label": "Entity Filer Category", "terseLabel": "Entity Filer Category" } } }, "localname": "EntityFilerCategory", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "filerCategoryItemType" }, "dei_EntityIncorporationStateCountryCode": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Two-character EDGAR code representing the state or country of incorporation.", "label": "Entity Incorporation State Country Code", "terseLabel": "Entity Incorporation, State or Country Code" } } }, "localname": "EntityIncorporationStateCountryCode", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "edgarStateCountryItemType" }, "dei_EntityInteractiveDataCurrent": { "auth_ref": [ "r478" ], "lang": { "en-us": { "role": { "documentation": "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).", "label": "Entity Interactive Data Current", "terseLabel": "Entity Interactive Data Current" } } }, "localname": "EntityInteractiveDataCurrent", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityPublicFloat": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.", "label": "Entity Public Float", "terseLabel": "Entity Public Float" } } }, "localname": "EntityPublicFloat", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "monetaryItemType" }, "dei_EntityRegistrantName": { "auth_ref": [ "r469" ], "lang": { "en-us": { "role": { "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.", "label": "Entity Registrant Name", "terseLabel": "Entity Registrant Name" } } }, "localname": "EntityRegistrantName", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityShellCompany": { "auth_ref": [ "r469" ], "lang": { "en-us": { "role": { "documentation": "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.", "label": "Entity Shell Company", "terseLabel": "Entity Shell Company" } } }, "localname": "EntityShellCompany", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntitySmallBusiness": { "auth_ref": [ "r469" ], "lang": { "en-us": { "role": { "documentation": "Indicates that the company is a Smaller Reporting Company (SRC).", "label": "Entity Small Business", "terseLabel": "Entity Small Business" } } }, "localname": "EntitySmallBusiness", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityTaxIdentificationNumber": { "auth_ref": [ "r469" ], "lang": { "en-us": { "role": { "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.", "label": "Entity Tax Identification Number", "terseLabel": "Entity Tax Identification Number" } } }, "localname": "EntityTaxIdentificationNumber", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "employerIdItemType" }, "dei_EntityVoluntaryFilers": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Indicate 'Yes' or 'No' if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.", "label": "Entity Voluntary Filers", "terseLabel": "Entity Voluntary Filers" } } }, "localname": "EntityVoluntaryFilers", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityWellKnownSeasonedIssuer": { "auth_ref": [ "r479" ], "lang": { "en-us": { "role": { "documentation": "Indicate 'Yes' or 'No' if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A.", "label": "Entity Well Known Seasoned Issuer", "terseLabel": "Entity Well-known Seasoned Issuer" } } }, "localname": "EntityWellKnownSeasonedIssuer", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_IcfrAuditorAttestationFlag": { "auth_ref": [ "r472", "r473", "r474" ], "lang": { "en-us": { "role": { "label": "Icfr Auditor Attestation Flag", "terseLabel": "ICFR Auditor Attestation Flag" } } }, "localname": "IcfrAuditorAttestationFlag", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_LocalPhoneNumber": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Local phone number for entity.", "label": "Local Phone Number", "terseLabel": "Local Phone Number" } } }, "localname": "LocalPhoneNumber", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_Security12bTitle": { "auth_ref": [ "r468" ], "lang": { "en-us": { "role": { "documentation": "Title of a 12(b) registered security.", "label": "Security12b Title", "terseLabel": "Title of 12(b) Security" } } }, "localname": "Security12bTitle", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "securityTitleItemType" }, "dei_SecurityExchangeName": { "auth_ref": [ "r471" ], "lang": { "en-us": { "role": { "documentation": "Name of the Exchange on which a security is registered.", "label": "Security Exchange Name", "terseLabel": "Security Exchange Name" } } }, "localname": "SecurityExchangeName", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "edgarExchangeCodeItemType" }, "dei_TradingSymbol": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Trading symbol of an instrument as listed on an exchange.", "label": "Trading Symbol", "terseLabel": "Trading Symbol" } } }, "localname": "TradingSymbol", "nsuri": "http://xbrl.sec.gov/dei/2021q4", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "tradingSymbolItemType" }, "prld_AccruedExpensesAndOtherCurrentLiabilitiesTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Accrued expenses and other current liabilities.", "label": "Accrued Expenses And Other Current Liabilities [Text Block]", "terseLabel": "Accrued Expenses and Other Current Liabilities" } } }, "localname": "AccruedExpensesAndOtherCurrentLiabilitiesTextBlock", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilities" ], "xbrltype": "textBlockItemType" }, "prld_AccruedResearchAndDevelopmentLiabilitiesCurrent": { "auth_ref": [], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails": { "order": 10020.0, "parentTag": "us-gaap_AccruedLiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Accrued research and development liabilities, current.", "label": "Accrued Research And Development Liabilities Current", "terseLabel": "Research and development" } } }, "localname": "AccruedResearchAndDevelopmentLiabilitiesCurrent", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "prld_AggregateEstimatedRentPaymentsDueOverInitialTerm": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Aggregate estimated rent payments due over initial term.", "label": "Aggregate Estimated Rent Payments Due Over Initial Term", "terseLabel": "Aggregate estimated rent payments due over initial term" } } }, "localname": "AggregateEstimatedRentPaymentsDueOverInitialTerm", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "prld_AreaOfLeasePremises": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Area of lease premises.", "label": "Area Of Lease Premises", "terseLabel": "Area of lease premises" } } }, "localname": "AreaOfLeasePremises", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "areaItemType" }, "prld_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainNetOfTax": { "auth_ref": [], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails": { "order": 10010.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Available for sale debt securities accumulated gross unrealized gain net of tax.", "label": "Available For Sale Debt Securities Accumulated Gross Unrealized Gain Net Of Tax", "terseLabel": "Marketable securities, Gross unrealized gain" } } }, "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainNetOfTax", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "monetaryItemType" }, "prld_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossNetOfTax": { "auth_ref": [], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails": { "order": 10020.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Available for sale debt securities accumulated gross unrealized loss net of tax.", "label": "Available For Sale Debt Securities Accumulated Gross Unrealized Loss Net Of Tax", "negatedLabel": "Marketable securities, Gross unrealized loss" } } }, "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossNetOfTax", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "monetaryItemType" }, "prld_BeneficialOwnershipPercentage": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Beneficial ownership percentage.", "label": "Beneficial Ownership Percentage", "terseLabel": "Beneficial ownership percentage" } } }, "localname": "BeneficialOwnershipPercentage", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "prld_CapitalLeaseTerm": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Capital Lease Term", "label": "Capital Lease Term", "terseLabel": "Lease term" } } }, "localname": "CapitalLeaseTerm", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "prld_ChestnutRunLeaseMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Chestnut run lease.", "label": "Chestnut Run Lease [Member]", "terseLabel": "Chestnut Run Lease" } } }, "localname": "ChestnutRunLeaseMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsTables" ], "xbrltype": "domainItemType" }, "prld_DarwinHealthIncMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Darwin Health, Inc.", "label": "Darwin Health Inc [Member]", "terseLabel": "DarwinHealth" } } }, "localname": "DarwinHealthIncMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "prld_DeferredTaxAssetsTaxDeferredExpenseLeaseLiabilities": { "auth_ref": [], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10110.0, "parentTag": "us-gaap_DeferredTaxAssetsGross", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Deferred tax assets tax deferred expense lease liabilities.", "label": "Deferred Tax Assets Tax Deferred Expense Lease Liabilities", "terseLabel": "Lease liabilities" } } }, "localname": "DeferredTaxAssetsTaxDeferredExpenseLeaseLiabilities", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "prld_DeferredTaxLiabilitiesDepreciation": { "auth_ref": [], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10040.0, "parentTag": "us-gaap_DeferredIncomeTaxLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Deferred Tax Liabilities, Depreciation", "label": "Deferred Tax Liabilities Depreciation", "negatedLabel": "Depreciation" } } }, "localname": "DeferredTaxLiabilitiesDepreciation", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "prld_DeferredTaxLiabilitiesRightOfUseAssets": { "auth_ref": [], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10030.0, "parentTag": "us-gaap_DeferredIncomeTaxLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Deferred tax liabilities right of use assets.", "label": "Deferred Tax Liabilities Right Of Use Assets", "negatedLabel": "Right-of-use assets" } } }, "localname": "DeferredTaxLiabilitiesRightOfUseAssets", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "prld_DelawareMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Delaware [Member]", "label": "Delaware [Member]", "terseLabel": "Delaware" } } }, "localname": "DelawareMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "prld_DocumentDocumentAndEntityInformationAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Document Document And Entity Information [Abstract]", "label": "Document Document And Entity Information [Abstract]", "terseLabel": "Document - Document and Entity Information [Abstract]" } } }, "localname": "DocumentDocumentAndEntityInformationAbstract", "nsuri": "http://preludetx.com/20211231", "xbrltype": "stringItemType" }, "prld_EligibleEmployeesContributionPercentage": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Eligible employees contribution percentage.", "label": "Eligible Employees Contribution Percentage", "terseLabel": "Eligible employees contribution percentage" } } }, "localname": "EligibleEmployeesContributionPercentage", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "prld_EstimatedAmountOfPaymentOverAgreementTermInThreeEqualInstallments": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Estimated amount of payment over a agreement term in three equal installments.", "label": "Estimated Amount Of Payment Over Agreement Term In Three Equal Installments", "terseLabel": "Estimated amount of payment over a agreement term" } } }, "localname": "EstimatedAmountOfPaymentOverAgreementTermInThreeEqualInstallments", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "prld_EstimatedNumberOfYearResearchCollaborationAgreement": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Estimated number of year research collaboration agreement.", "label": "Estimated Number Of Year Research Collaboration Agreement", "terseLabel": "Estimated years of research collaboration agreement" } } }, "localname": "EstimatedNumberOfYearResearchCollaborationAgreement", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "prld_ExercisePriceRangeFourMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Exercise price range four.", "label": "Exercise Price Range Four [Member]", "terseLabel": "$31.31 - $88.98" } } }, "localname": "ExercisePriceRangeFourMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "domainItemType" }, "prld_ExercisePriceRangeOneMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Exercise price range one.", "label": "Exercise Price Range One [Member]", "terseLabel": "$0.31 - $7.37" } } }, "localname": "ExercisePriceRangeOneMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "domainItemType" }, "prld_ExercisePriceRangeThreeMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Exercise price range three.", "label": "Exercise Price Range Three [Member]", "terseLabel": "$13.09 - $31.30" } } }, "localname": "ExercisePriceRangeThreeMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "domainItemType" }, "prld_ExercisePriceRangeTwoMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Exercise price range two.", "label": "Exercise Price Range Two [Member]", "terseLabel": "$7.38 - $13.08" } } }, "localname": "ExercisePriceRangeTwoMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "domainItemType" }, "prld_FollowOnOfferingMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Follow-on offering.", "label": "Follow On Offering [Member]", "terseLabel": "Follow-on Offering" } } }, "localname": "FollowOnOfferingMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "prld_GracePeriodForPotentialRefund": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Grace period for potential refund.", "label": "Grace Period For Potential Refund", "terseLabel": "Grace period following research term for potential refund" } } }, "localname": "GracePeriodForPotentialRefund", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "prld_IncomeTaxDisclosureLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Income Tax Disclosure [Line Items]", "label": "Income Tax Disclosure [Line Items]", "terseLabel": "Income Tax Disclosure [Line Items]" } } }, "localname": "IncomeTaxDisclosureLineItems", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "prld_IncomeTaxDisclosureTable": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Income Tax Disclosure [Table]", "label": "Income Tax Disclosure [Table]", "terseLabel": "Income Tax Disclosure [Table]" } } }, "localname": "IncomeTaxDisclosureTable", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "prld_IncreaseDecreaseInOperatingLeaseLiabilities": { "auth_ref": [], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10230.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Increase decrease in operating lease liabilities.", "label": "Increase Decrease In Operating Lease Liabilities", "negatedLabel": "Operating lease liabilities" } } }, "localname": "IncreaseDecreaseInOperatingLeaseLiabilities", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "prld_InitialTermOfLease": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Initial term of lease.", "label": "Initial Term Of Lease", "terseLabel": "Initial term of lease" } } }, "localname": "InitialTermOfLease", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "prld_InterestExpensePercentageAssetsUnderCapitalLease": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Interest Expense Percentage Assets Under Capital Lease", "label": "Interest Expense Percentage Assets Under Capital Lease", "terseLabel": "Effective interest percentage" } } }, "localname": "InterestExpensePercentageAssetsUnderCapitalLease", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "prld_LeaseCommencementDate": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Lease commencement date.", "label": "Lease Commencement Date", "terseLabel": "Lease commencement date" } } }, "localname": "LeaseCommencementDate", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "dateItemType" }, "prld_LeaseLiabilityLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Lease liability.", "label": "Lease Liability [Line Items]", "terseLabel": "Lease Liability [Line Items]" } } }, "localname": "LeaseLiabilityLineItems", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "stringItemType" }, "prld_LeaseLiabilityTable": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Lease liability.", "label": "Lease Liability [Table]", "terseLabel": "Lease Liability [Table]" } } }, "localname": "LeaseLiabilityTable", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "stringItemType" }, "prld_NonCancellableLeasePeriod": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Non cancellable lease period.", "label": "Non Cancellable Lease Period", "terseLabel": "Non cancellable lease period" } } }, "localname": "NonCancellableLeasePeriod", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "prld_NumberOfEqualInstalments": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Number of equal instalments.", "label": "Number Of Equal Instalments", "terseLabel": "Number of equal instalments" } } }, "localname": "NumberOfEqualInstalments", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "prld_NumberOfEquityIncentivePlans": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Number of equity incentive plans.", "label": "Number Of Equity Incentive Plans", "terseLabel": "Number of equity incentive plans" } } }, "localname": "NumberOfEquityIncentivePlans", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "prld_NumberOfLeaseExtensions": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Number of lease extensions.", "label": "Number Of Lease Extensions", "terseLabel": "Number of lease extensions" } } }, "localname": "NumberOfLeaseExtensions", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "prld_OfferingCostsInAccountsPayable": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Offering costs in accounts payable.", "label": "Offering Costs In Accounts Payable", "terseLabel": "Offering costs in accounts payable" } } }, "localname": "OfferingCostsInAccountsPayable", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "prld_OfferingCostsInAccruedExpenses": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Offering costs in accrued expenses.", "label": "Offering Costs In Accrued Expenses", "terseLabel": "Offering costs in accrued expenses" } } }, "localname": "OfferingCostsInAccruedExpenses", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "prld_OffsetAccruedExpenseAndOtherCurrentLiabilitiesToEliminateDeferredRent": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Offset accrued expense and other current liabilities to eliminate deferred rent.", "label": "Offset Accrued Expense And Other Current Liabilities To Eliminate Deferred Rent", "terseLabel": "Offset accrued expense and other current liabilities to eliminate deferred rent" } } }, "localname": "OffsetAccruedExpenseAndOtherCurrentLiabilitiesToEliminateDeferredRent", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "prld_OperatingLeaseEstimatedIncrementalBorrowingRatePercent": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Operating lease estimated incremental borrowing rate percent.", "label": "Operating Lease Estimated Incremental Borrowing Rate Percent", "terseLabel": "Operating lease estimated incremental borrowing rate percent" } } }, "localname": "OperatingLeaseEstimatedIncrementalBorrowingRatePercent", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "prld_OperatingLeaseExpiringDecember2022Member": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Operating lease expiring december 2022.", "label": "Operating Lease Expiring December2022 [Member]", "terseLabel": "Operating Lease Expiring December 2022" } } }, "localname": "OperatingLeaseExpiringDecember2022Member", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsTables" ], "xbrltype": "domainItemType" }, "prld_ParticipantsAccrueRightsToPurchaseMaximumCommonStockAmount": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Participants accrue rights to purchase maximum common stock amount.", "label": "Participants Accrue Rights To Purchase Maximum Common Stock Amount", "terseLabel": "Participants accrue rights to purchase maximum common stock amount" } } }, "localname": "ParticipantsAccrueRightsToPurchaseMaximumCommonStockAmount", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "prld_PaymentsOfOfferingCosts": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Payments of offering costs.", "label": "Payments Of Offering Costs", "verboseLabel": "Sale of common stock, offering costs" } } }, "localname": "PaymentsOfOfferingCosts", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICITPARENTHETICAL" ], "xbrltype": "monetaryItemType" }, "prld_PercentageOfSharesOutstandingUsedToCalculateAnnualIncreaseInNumberOfSharesThatCanBeIssued": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Percentage of shares outstanding used to calculate annual increase in number of shares that can be issued.", "label": "Percentage Of Shares Outstanding Used To Calculate Annual Increase In Number Of Shares That Can Be Issued", "terseLabel": "Percentage of shares outstanding used to calculate annual increase in number of shares that can be issued" } } }, "localname": "PercentageOfSharesOutstandingUsedToCalculateAnnualIncreaseInNumberOfSharesThatCanBeIssued", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "prld_PotentialRefundReceivableFromAgreement": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Potential refund receivable from agreement.", "label": "Potential Refund Receivable From Agreement", "terseLabel": "Potential refund receivable from agreement" } } }, "localname": "PotentialRefundReceivableFromAgreement", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "prld_PropertyPlantAndEquipmentUsefulLifeTableTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Property, Plant and Equipment, Useful Life [Table Text Block]", "label": "Property Plant And Equipment Useful Life Table [Text Block]", "terseLabel": "Schedule of Property Plant and Equipment Useful Life" } } }, "localname": "PropertyPlantAndEquipmentUsefulLifeTableTextBlock", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables" ], "xbrltype": "textBlockItemType" }, "prld_ResearchTerm": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Research term.", "label": "Research Term", "terseLabel": "Research term" } } }, "localname": "ResearchTerm", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "prld_RisksAndLiquidityAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Risks and liquidity.", "label": "Risks And Liquidity [Abstract]" } } }, "localname": "RisksAndLiquidityAbstract", "nsuri": "http://preludetx.com/20211231", "xbrltype": "stringItemType" }, "prld_RisksAndLiquidityTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Risks and liquidity.", "label": "Risks And Liquidity [Text Block]", "terseLabel": "Risks and Liquidity" } } }, "localname": "RisksAndLiquidityTextBlock", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureRisksAndLiquidity" ], "xbrltype": "textBlockItemType" }, "prld_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Schedule of accrued expenses and other current liabilities.", "label": "Schedule Of Accrued Expenses And Other Current Liabilities Table [Text Block]", "terseLabel": "Summary of Accrued Expenses and Other Current Liabilities" } } }, "localname": "ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables" ], "xbrltype": "textBlockItemType" }, "prld_ScheduleOfFederalStateAndLocalNetOperatingLossesAndResearchTaxCreditsTableTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Schedule of federal state and local net operating losses and research tax credits.", "label": "Schedule Of Federal State And Local Net Operating Losses And Research Tax Credits Table [Text Block]", "terseLabel": "Schedule of Federal and State Net Operating Losses and Research Tax Credits" } } }, "localname": "ScheduleOfFederalStateAndLocalNetOperatingLossesAndResearchTaxCreditsTableTextBlock", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesTables" ], "xbrltype": "textBlockItemType" }, "prld_SeriesAConvertiblePreferredStockMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Series A convertible preferred stock.", "label": "Series A Convertible Preferred Stock [Member]", "terseLabel": "Series A Convertible Preferred Stock" } } }, "localname": "SeriesAConvertiblePreferredStockMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "domainItemType" }, "prld_SeriesBConvertiblePreferredStockMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Series B convertible preferred stock.", "label": "Series B Convertible Preferred Stock [Member]", "terseLabel": "Series B Convertible Preferred Stock", "verboseLabel": "Series B Convertible Preferred Stock" } } }, "localname": "SeriesBConvertiblePreferredStockMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICITPARENTHETICAL" ], "xbrltype": "domainItemType" }, "prld_SeriesCConvertiblePreferredStockMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Series C convertible preferred stock.", "label": "Series C Convertible Preferred Stock [Member]", "terseLabel": "Series C Convertible Preferred Stock" } } }, "localname": "SeriesCConvertiblePreferredStockMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICITPARENTHETICAL" ], "xbrltype": "domainItemType" }, "prld_ShortTermLeaseMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Short-term lease.", "label": "Short Term Lease [Member]", "terseLabel": "Short-Term Lease" } } }, "localname": "ShortTermLeaseMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "prld_SummaryOfSignificantAccountingPoliciesLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Summary of significant accounting policies.", "label": "Summary Of Significant Accounting Policies [Line Items]", "terseLabel": "Summary of Significant Accounting Policies [Line Items]" } } }, "localname": "SummaryOfSignificantAccountingPoliciesLineItems", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "prld_SummaryOfSignificantAccountingPoliciesTable": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Summary of significant accounting policies.", "label": "Summary Of Significant Accounting Policies [Table]", "terseLabel": "Summary Of Significant Accounting Policies [Table]" } } }, "localname": "SummaryOfSignificantAccountingPoliciesTable", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "prld_TaxCreditCarryforwardExpirationYear": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Tax Credit Carryforward, Expiration Year", "label": "Tax Credit Carryforward Expiration Year", "terseLabel": "Tax credits expiration year" } } }, "localname": "TaxCreditCarryforwardExpirationYear", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "gYearItemType" }, "prld_TaxCreditPolicyTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Tax credit.", "label": "Tax Credit Policy [Text Block]", "terseLabel": "Grant Income and Research and Development Tax Credits" } } }, "localname": "TaxCreditPolicyTextBlock", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "prld_TemporaryEquityAdditionalSharesIssuable": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Temporary equity additional shares issuable.", "label": "Temporary Equity Additional Shares Issuable", "terseLabel": "Additional shares issuable" } } }, "localname": "TemporaryEquityAdditionalSharesIssuable", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "prld_TemporaryEquityPricePerShare": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Temporary equity price per share.", "label": "Temporary Equity Price Per Share", "terseLabel": "Convertible preferred stock, price per share" } } }, "localname": "TemporaryEquityPricePerShare", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "perShareItemType" }, "prld_TemporaryEquityStockConvertedDuringPeriodShares": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Temporary equity stock converted during period shares.", "label": "Temporary Equity Stock Converted During Period Shares", "terseLabel": "Conversion of convertible preferred stock upon initial public offering (shares)" } } }, "localname": "TemporaryEquityStockConvertedDuringPeriodShares", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "sharesItemType" }, "prld_TemporaryEquityStockConvertedDuringPeriodValue": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Temporary equity stock converted during period value.", "label": "Temporary Equity Stock Converted During Period Value", "terseLabel": "Conversion of convertible preferred stock upon initial public offering" } } }, "localname": "TemporaryEquityStockConvertedDuringPeriodValue", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "monetaryItemType" }, "prld_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Temporary equity stock issued during period shares new issues.", "label": "Temporary Equity Stock Issued During Period Shares New Issues", "terseLabel": "Sale of convertible preferred stock, net of issuance costs (shares)" } } }, "localname": "TemporaryEquityStockIssuedDuringPeriodSharesNewIssues", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "sharesItemType" }, "prld_TwoThousandTwentyEmployeeStockPurchasePlanMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Two thousand twenty employee stock purchase plan.", "label": "Two Thousand Twenty Employee Stock Purchase Plan [Member]", "terseLabel": "2020 Employee Stock Purchase Plan" } } }, "localname": "TwoThousandTwentyEmployeeStockPurchasePlanMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "prld_TwoThousandTwentyEquityIncentivePlanMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Two thousand twenty equity incentive plan.", "label": "Two Thousand Twenty Equity Incentive Plan [Member]", "terseLabel": "2020 Equity Incentive Plan" } } }, "localname": "TwoThousandTwentyEquityIncentivePlanMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "prld_UnrealizedGainLossOnMarketableSecurities": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Unrealized gain (loss) on marketable securities.", "label": "Unrealized Gain Loss On Marketable Securities", "terseLabel": "Unrealized gain (loss) on marketable securities" } } }, "localname": "UnrealizedGainLossOnMarketableSecurities", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "prld_VotingCommonStockMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Voting common stock.", "label": "Voting Common Stock [Member]", "terseLabel": "Voting Common Stock" } } }, "localname": "VotingCommonStockMember", "nsuri": "http://preludetx.com/20211231", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "domainItemType" }, "srt_MaximumMember": { "auth_ref": [ "r192", "r201", "r235", "r237", "r394", "r395", "r396", "r397", "r398", "r399", "r400", "r431", "r432", "r465", "r466" ], "lang": { "en-us": { "role": { "label": "Maximum [Member]", "terseLabel": "Maximum" } } }, "localname": "MaximumMember", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_MinimumMember": { "auth_ref": [ "r192", "r201", "r235", "r237", "r394", "r395", "r396", "r397", "r398", "r399", "r400", "r431", "r432", "r465", "r466" ], "lang": { "en-us": { "role": { "label": "Minimum [Member]", "terseLabel": "Minimum" } } }, "localname": "MinimumMember", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_ProFormaMember": { "auth_ref": [ "r104", "r178", "r390" ], "lang": { "en-us": { "role": { "label": "Pro Forma [Member]", "terseLabel": "Pro Forma" } } }, "localname": "ProFormaMember", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_RangeAxis": { "auth_ref": [ "r192", "r201", "r226", "r235", "r237", "r394", "r395", "r396", "r397", "r398", "r399", "r400", "r431", "r432", "r465", "r466" ], "lang": { "en-us": { "role": { "label": "Range [Axis]", "terseLabel": "Statistical Measurement" } } }, "localname": "RangeAxis", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "srt_RangeMember": { "auth_ref": [ "r192", "r201", "r226", "r235", "r237", "r394", "r395", "r396", "r397", "r398", "r399", "r400", "r431", "r432", "r465", "r466" ], "lang": { "en-us": { "role": { "label": "Range [Member]", "terseLabel": "Statistical Measurement" } } }, "localname": "RangeMember", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_ScenarioUnspecifiedDomain": { "auth_ref": [ "r99", "r104", "r236" ], "lang": { "en-us": { "role": { "label": "Scenario Unspecified [Domain]", "terseLabel": "Scenario" } } }, "localname": "ScenarioUnspecifiedDomain", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_StatementScenarioAxis": { "auth_ref": [ "r99", "r104", "r178", "r236", "r390" ], "lang": { "en-us": { "role": { "label": "Statement Scenario [Axis]", "terseLabel": "Scenario" } } }, "localname": "StatementScenarioAxis", "nsuri": "http://fasb.org/srt/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccountingPoliciesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Accounting Policies [Abstract]" } } }, "localname": "AccountingPoliciesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_AccountingStandardsUpdate201602Member": { "auth_ref": [ "r373" ], "lang": { "en-us": { "role": { "documentation": "Accounting Standards Update 2016-02 Leases (Topic 842).", "label": "Accounting Standards Update201602 [Member]", "terseLabel": "ASU 2016-02" } } }, "localname": "AccountingStandardsUpdate201602Member", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccountsPayableCurrent": { "auth_ref": [ "r35", "r388" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10110.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).", "label": "Accounts Payable Current", "terseLabel": "Accounts payable" } } }, "localname": "AccountsPayableCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments": { "auth_ref": [ "r75" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10190.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.", "label": "Accretion Amortization Of Discounts And Premiums Investments", "negatedLabel": "Amortization of premium and discount on marketable securities, net" } } }, "localname": "AccretionAmortizationOfDiscountsAndPremiumsInvestments", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccruedLiabilitiesCurrent": { "auth_ref": [ "r39" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10120.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).", "label": "Accrued Liabilities Current", "terseLabel": "Accrued expenses and other current liabilities", "totalLabel": "Accrued expenses and other current liabilities" } } }, "localname": "AccruedLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment": { "auth_ref": [ "r34", "r170" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails": { "order": 10020.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.", "label": "Accumulated Depreciation Depletion And Amortization Property Plant And Equipment", "negatedLabel": "Less accumulated depreciation" } } }, "localname": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": { "auth_ref": [ "r25", "r49", "r50", "r51", "r424", "r440", "r444" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10070.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.", "label": "Accumulated Other Comprehensive Income Loss Net Of Tax", "terseLabel": "Accumulated other comprehensive income (loss)" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeMember": { "auth_ref": [ "r48", "r51", "r58", "r59", "r60", "r88", "r89", "r90", "r331", "r435", "r436", "r485" ], "lang": { "en-us": { "role": { "documentation": "Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.", "label": "Accumulated Other Comprehensive Income [Member]", "terseLabel": "Accumulated Other Comprehensive Income (Loss)" } } }, "localname": "AccumulatedOtherComprehensiveIncomeMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "domainItemType" }, "us-gaap_AdditionalPaidInCapitalCommonStock": { "auth_ref": [ "r23" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10060.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.", "label": "Additional Paid In Capital Common Stock", "terseLabel": "Additional paid-in capital" } } }, "localname": "AdditionalPaidInCapitalCommonStock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdditionalPaidInCapitalMember": { "auth_ref": [ "r88", "r89", "r90", "r282", "r283", "r284", "r345" ], "lang": { "en-us": { "role": { "documentation": "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.", "label": "Additional Paid In Capital [Member]", "terseLabel": "Additional Paid-in Capital" } } }, "localname": "AdditionalPaidInCapitalMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "domainItemType" }, "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis": { "auth_ref": [ "r0", "r1", "r2", "r3", "r4", "r92", "r93", "r94", "r95", "r104", "r145", "r146", "r158", "r159", "r160", "r161", "r163", "r164", "r180", "r278", "r279", "r280", "r281", "r282", "r283", "r284", "r285", "r312", "r313", "r314", "r315", "r337", "r338", "r339", "r340", "r341", "r342", "r343", "r344", "r345", "r346", "r347", "r356", "r357", "r359", "r360", "r361", "r362", "r363", "r364", "r385", "r403", "r404", "r405", "r433", "r434", "r435", "r436", "r437", "r438", "r439", "r440", "r441", "r442", "r443", "r444", "r481", "r482", "r483", "r484", "r485" ], "lang": { "en-us": { "role": { "documentation": "Information by amendment to accounting standards.", "label": "Adjustments For New Accounting Pronouncements [Axis]", "terseLabel": "Accounting Standards Update" } } }, "localname": "AdjustmentsForNewAccountingPronouncementsAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract]", "terseLabel": "Adjustments to reconcile net loss to net cash used in operating activities:" } } }, "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_AllocatedShareBasedCompensationExpense": { "auth_ref": [ "r239", "r274", "r287" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.", "label": "Allocated Share Based Compensation Expense", "terseLabel": "Stock-based compensation expense" } } }, "localname": "AllocatedShareBasedCompensationExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseRecordedInStatementsOfOperationsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": { "auth_ref": [ "r112" ], "lang": { "en-us": { "role": { "documentation": "Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.", "label": "Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount", "terseLabel": "Antidilutive securities excluded from computation of earnings per share" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesOfCommonStockOutstandingDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis": { "auth_ref": [ "r112" ], "lang": { "en-us": { "role": { "documentation": "Information by type of antidilutive security.", "label": "Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis]", "terseLabel": "Antidilutive Securities" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesOfCommonStockOutstandingDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]", "terseLabel": "Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesOfCommonStockOutstandingDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AntidilutiveSecuritiesNameDomain": { "auth_ref": [ "r112" ], "lang": { "en-us": { "role": { "documentation": "Incremental common shares attributable to securities that were not included in diluted earnings per share (EPS) because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.", "label": "Antidilutive Securities Name [Domain]", "terseLabel": "Antidilutive Securities, Name" } } }, "localname": "AntidilutiveSecuritiesNameDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesOfCommonStockOutstandingDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ArrangementsAndNonarrangementTransactionsMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Collaborative arrangement and arrangement other than collaborative applicable to revenue-generating activity or operations.", "label": "Arrangements And Nonarrangement Transactions [Member]", "terseLabel": "Collaborative Arrangement and Arrangement Other than Collaborative" } } }, "localname": "ArrangementsAndNonarrangementTransactionsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_Assets": { "auth_ref": [ "r85", "r129", "r137", "r141", "r154", "r181", "r182", "r183", "r184", "r185", "r186", "r187", "r188", "r189", "r190", "r191", "r326", "r332", "r355", "r386", "r388", "r409", "r422" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.", "label": "Assets", "totalLabel": "Total assets" } } }, "localname": "Assets", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Assets [Abstract]", "terseLabel": "Assets" } } }, "localname": "AssetsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsCurrent": { "auth_ref": [ "r8", "r9", "r46", "r85", "r154", "r181", "r182", "r183", "r184", "r185", "r186", "r187", "r188", "r189", "r190", "r191", "r326", "r332", "r355", "r386", "r388" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10140.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.", "label": "Assets Current", "totalLabel": "Total current assets" } } }, "localname": "AssetsCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsCurrentAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Assets Current [Abstract]", "terseLabel": "Current assets:" } } }, "localname": "AssetsCurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis": { "auth_ref": [ "r150", "r165" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).", "label": "Available For Sale Debt Securities Amortized Cost Basis", "totalLabel": "Marketable securities, Amortized cost" } } }, "localname": "AvailableForSaleDebtSecuritiesAmortizedCostBasis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent": { "auth_ref": [ "r149", "r165" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails": { "order": 10030.0, "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.", "label": "Available For Sale Securities Debt Securities Current", "terseLabel": "Marketable securities, Fair value" } } }, "localname": "AvailableForSaleSecuritiesDebtSecuritiesCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AwardTypeAxis": { "auth_ref": [ "r241", "r276" ], "lang": { "en-us": { "role": { "documentation": "Information by type of award under share-based payment arrangement.", "label": "Award Type [Axis]", "terseLabel": "Award Type" } } }, "localname": "AwardTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_BasisOfAccountingPolicyPolicyTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).", "label": "Basis Of Accounting Policy Policy [Text Block]", "terseLabel": "Basis of presentation" } } }, "localname": "BasisOfAccountingPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_CapitalExpendituresIncurredButNotYetPaid": { "auth_ref": [ "r78", "r79", "r80" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Future cash outflow to pay for purchases of fixed assets that have occurred.", "label": "Capital Expenditures Incurred But Not Yet Paid", "terseLabel": "Property and equipment in accounts payable" } } }, "localname": "CapitalExpendituresIncurredButNotYetPaid", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashAndCashEquivalentsAtCarryingValue": { "auth_ref": [ "r6", "r31", "r76" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfReconciliationOfCashAndCashEquivalentsAndRestrictedCashDetails": { "order": 10010.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "weight": 1.0 }, "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10190.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.", "label": "Cash And Cash Equivalents At Carrying Value", "terseLabel": "Cash and cash equivalents" } } }, "localname": "CashAndCashEquivalentsAtCarryingValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfReconciliationOfCashAndCashEquivalentsAndRestrictedCashDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashAndCashEquivalentsAxis": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Information by type of cash and cash equivalent balance.", "label": "Cash And Cash Equivalents [Axis]", "terseLabel": "Cash and Cash Equivalents" } } }, "localname": "CashAndCashEquivalentsAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy": { "auth_ref": [ "r13", "r77", "r407" ], "lang": { "en-us": { "role": { "documentation": "Entity's cash and cash equivalents accounting policy with respect to restricted balances. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits.", "label": "Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy", "terseLabel": "Cash, Cash Equivalents and Restricted Cash" } } }, "localname": "CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": { "auth_ref": [ "r71", "r76", "r81" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfReconciliationOfCashAndCashEquivalentsAndRestrictedCashDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents", "totalLabel": "Total cash, cash equivalents, and restricted cash shown in statement of cash flows" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfReconciliationOfCashAndCashEquivalentsAndRestrictedCashDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": { "auth_ref": [ "r71", "r76", "r81" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations", "periodEndLabel": "Cash, cash equivalents and restricted cash at end of year", "periodStartLabel": "Cash, cash equivalents and restricted cash at beginning of year" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": { "auth_ref": [ "r71", "r365" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect", "totalLabel": "Net (decrease) increase in cash and cash equivalents" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdopted": { "auth_ref": [ "r0", "r1", "r88", "r89", "r91", "r145", "r146", "r155", "r156", "r157", "r158", "r159", "r180", "r278", "r279", "r280", "r312", "r336", "r337", "r338", "r356", "r358", "r359", "r360", "r363", "r364", "r374", "r385", "r403", "r404", "r433", "r434", "r481" ], "lang": { "en-us": { "role": { "documentation": "Indicates (true false) whether accounting standards update was adopted.", "label": "Change In Accounting Principle Accounting Standards Update Adopted", "terseLabel": "Change in accounting principle, ASU, adopted" } } }, "localname": "ChangeInAccountingPrincipleAccountingStandardsUpdateAdopted", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "booleanItemType" }, "us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdoptionDate": { "auth_ref": [ "r0", "r1", "r88", "r89", "r98", "r145", "r146", "r155", "r156", "r157", "r158", "r159", "r180", "r278", "r279", "r280", "r312", "r336", "r337", "r338", "r339", "r342", "r356", "r358", "r359", "r360", "r363", "r364", "r374", "r385", "r403", "r404", "r433", "r434", "r481" ], "lang": { "en-us": { "role": { "documentation": "Date accounting standards update was adopted, in YYYY-MM-DD format.", "label": "Change In Accounting Principle Accounting Standards Update Adoption Date", "terseLabel": "Change in accounting principle, ASU, adoption date" } } }, "localname": "ChangeInAccountingPrincipleAccountingStandardsUpdateAdoptionDate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "dateItemType" }, "us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateImmaterialEffect": { "auth_ref": [ "r92", "r103", "r147", "r162", "r285", "r316" ], "lang": { "en-us": { "role": { "documentation": "Indicates (true false) whether effect from applying amendment to accounting standards is immaterial.", "label": "Change In Accounting Principle Accounting Standards Update Immaterial Effect", "terseLabel": "Change in accounting principle, ASU, immaterial effect" } } }, "localname": "ChangeInAccountingPrincipleAccountingStandardsUpdateImmaterialEffect", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "booleanItemType" }, "us-gaap_ClassOfStockDisclosuresAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Class Of Stock Disclosures [Abstract]" } } }, "localname": "ClassOfStockDisclosuresAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_ClassOfStockDomain": { "auth_ref": [ "r83", "r85", "r105", "r106", "r107", "r109", "r111", "r115", "r116", "r117", "r154", "r181", "r185", "r186", "r187", "r190", "r191", "r199", "r200", "r204", "r208", "r355", "r476" ], "lang": { "en-us": { "role": { "documentation": "Share of stock differentiated by the voting rights the holder receives. Examples include, but are not limited to, common stock, redeemable preferred stock, nonredeemable preferred stock, and convertible stock.", "label": "Class Of Stock [Domain]", "terseLabel": "Class of Stock" } } }, "localname": "ClassOfStockDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICITPARENTHETICAL" ], "xbrltype": "domainItemType" }, "us-gaap_ClassOfStockLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Class Of Stock [Line Items]", "terseLabel": "Class Of Stock [Line Items]" } } }, "localname": "ClassOfStockLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CommercialPaperMember": { "auth_ref": [ "r179" ], "lang": { "en-us": { "role": { "documentation": "Unsecured promissory note (generally negotiable) that provides institutions with short-term funds.", "label": "Commercial Paper [Member]", "terseLabel": "Commercial Paper" } } }, "localname": "CommercialPaperMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CommitmentsAndContingencies": { "auth_ref": [ "r42", "r177", "r412", "r428" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10020.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.", "label": "Commitments And Contingencies", "terseLabel": "Commitments (note 8)" } } }, "localname": "CommitmentsAndContingencies", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Commitments And Contingencies Disclosure [Abstract]" } } }, "localname": "CommitmentsAndContingenciesDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_CommitmentsDisclosureTextBlock": { "auth_ref": [ "r176" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for significant arrangements with third parties, which includes operating lease arrangements and arrangements in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services, and operating lease arrangements. Descriptions may include identification of the specific goods and services, period of time covered, minimum quantities and amounts, and cancellation rights.", "label": "Commitments Disclosure [Text Block]", "terseLabel": "Commitments" } } }, "localname": "CommitmentsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitments" ], "xbrltype": "textBlockItemType" }, "us-gaap_CommonStockMember": { "auth_ref": [ "r88", "r89", "r345" ], "lang": { "en-us": { "role": { "documentation": "Stock that is subordinate to all other stock of the issuer.", "label": "Common Stock [Member]", "terseLabel": "Common Stock" } } }, "localname": "CommonStockMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "domainItemType" }, "us-gaap_CommonStockParOrStatedValuePerShare": { "auth_ref": [ "r22" ], "lang": { "en-us": { "role": { "documentation": "Face amount or stated value per share of common stock.", "label": "Common Stock Par Or Stated Value Per Share", "terseLabel": "Common stock, par value" } } }, "localname": "CommonStockParOrStatedValuePerShare", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockSharesAuthorized": { "auth_ref": [ "r22" ], "lang": { "en-us": { "role": { "documentation": "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.", "label": "Common Stock Shares Authorized", "terseLabel": "Common stock, shares authorized" } } }, "localname": "CommonStockSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesIssued": { "auth_ref": [ "r22" ], "lang": { "en-us": { "role": { "documentation": "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.", "label": "Common Stock Shares Issued", "terseLabel": "Common stock, shares, issued" } } }, "localname": "CommonStockSharesIssued", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesOutstanding": { "auth_ref": [ "r22", "r216" ], "lang": { "en-us": { "role": { "documentation": "Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.", "label": "Common Stock Shares Outstanding", "terseLabel": "Common stock, shares, outstanding" } } }, "localname": "CommonStockSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockValue": { "auth_ref": [ "r22", "r388" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10040.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.", "label": "Common Stock Value", "terseLabel": "Common stock" } } }, "localname": "CommonStockValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_CommonStockVotingRights": { "auth_ref": [ "r217" ], "lang": { "en-us": { "role": { "documentation": "Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.", "label": "Common Stock Voting Rights", "terseLabel": "Common stock, voting rights" } } }, "localname": "CommonStockVotingRights", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CompensationRelatedCostsPolicyTextBlock": { "auth_ref": [ "r247" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for salaries, bonuses, incentive awards, postretirement and postemployment benefits granted to employees, including equity-based arrangements; discloses methodologies for measurement, and the bases for recognizing related assets and liabilities and recognizing and reporting compensation expense.", "label": "Compensation Related Costs Policy [Text Block]", "terseLabel": "Stock-Based Compensation" } } }, "localname": "CompensationRelatedCostsPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ComprehensiveIncomeNetOfTax": { "auth_ref": [ "r53", "r55", "r56", "r62", "r414", "r430" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.", "label": "Comprehensive Income Net Of Tax", "totalLabel": "Comprehensive loss" } } }, "localname": "ComprehensiveIncomeNetOfTax", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ComprehensiveIncomePolicyPolicyTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for comprehensive income.", "label": "Comprehensive Income Policy Policy [Text Block]", "terseLabel": "Comprehensive Loss" } } }, "localname": "ComprehensiveIncomePolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ConcentrationRiskCreditRisk": { "auth_ref": [ "r121", "r419" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for credit risk.", "label": "Concentration Risk Credit Risk", "terseLabel": "Concentration of Credit Risk" } } }, "localname": "ConcentrationRiskCreditRisk", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ConstructionInProgressMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.", "label": "Construction In Progress [Member]", "terseLabel": "Construction in progress" } } }, "localname": "ConstructionInProgressMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion": { "auth_ref": [ "r20", "r21", "r211", "r217", "r220" ], "lang": { "en-us": { "role": { "documentation": "Number of shares issued for each share of convertible preferred stock that is converted.", "label": "Convertible Preferred Stock Shares Issued Upon Conversion", "terseLabel": "Convertible preferred stock converted into common stock" } } }, "localname": "ConvertiblePreferredStockSharesIssuedUponConversion", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_CorporateDebtSecuritiesMember": { "auth_ref": [ "r227", "r234", "r445" ], "lang": { "en-us": { "role": { "documentation": "Debt securities issued by domestic or foreign corporate business, banks and other entities with a promise of repayment.", "label": "Corporate Debt Securities [Member]", "terseLabel": "Corporate Debt Securities" } } }, "localname": "CorporateDebtSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition": { "auth_ref": [ "r151", "r166", "r168" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.", "label": "Debt Securities Available For Sale Unrealized Loss Position", "terseLabel": "Securities fair market value unrealized loss position" } } }, "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPosition", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions": { "auth_ref": [ "r152", "r167" ], "lang": { "en-us": { "role": { "documentation": "Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.", "label": "Debt Securities Available For Sale Unrealized Loss Position Number Of Positions", "terseLabel": "Number of marketable securities" } } }, "localname": "DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "us-gaap_DeferredIncomeTaxLiabilities": { "auth_ref": [ "r17", "r18", "r301", "r410", "r420" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10020.0, "parentTag": "us-gaap_DeferredTaxAssetsLiabilitiesNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of deferred tax liability attributable to taxable temporary differences.", "label": "Deferred Income Tax Liabilities", "negatedTotalLabel": "Total deferred tax liabilities" } } }, "localname": "DeferredIncomeTaxLiabilities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsGross": { "auth_ref": [ "r302" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10050.0, "parentTag": "us-gaap_DeferredTaxAssetsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.", "label": "Deferred Tax Assets Gross", "totalLabel": "Gross deferred tax assets" } } }, "localname": "DeferredTaxAssetsGross", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment": { "auth_ref": [ "r309", "r310" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10080.0, "parentTag": "us-gaap_DeferredTaxAssetsGross", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs expensed in connection with a business combination.", "label": "Deferred Tax Assets In Process Research And Development", "terseLabel": "Research and development credits", "verboseLabel": "Research and development tax credits" } } }, "localname": "DeferredTaxAssetsInProcessResearchAndDevelopment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsLiabilitiesNet": { "auth_ref": [ "r304" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.", "label": "Deferred Tax Assets Liabilities Net", "totalLabel": "Net deferred tax assets" } } }, "localname": "DeferredTaxAssetsLiabilitiesNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsNet": { "auth_ref": [ "r304" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10010.0, "parentTag": "us-gaap_DeferredTaxAssetsLiabilitiesNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.", "label": "Deferred Tax Assets Net", "totalLabel": "Total deferred tax asset" } } }, "localname": "DeferredTaxAssetsNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsNetAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Deferred Tax Assets Net [Abstract]", "terseLabel": "Deferred tax assets:" } } }, "localname": "DeferredTaxAssetsNetAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DeferredTaxAssetsOperatingLossCarryforwards": { "auth_ref": [ "r309", "r310" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10070.0, "parentTag": "us-gaap_DeferredTaxAssetsGross", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.", "label": "Deferred Tax Assets Operating Loss Carryforwards", "terseLabel": "Net operating loss carryforwards", "verboseLabel": "NOL carryforwards" } } }, "localname": "DeferredTaxAssetsOperatingLossCarryforwards", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfFederalAndStateNetOperatingLossesAndResearchTaxCreditsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch": { "auth_ref": [ "r307", "r309", "r310" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.", "label": "Deferred Tax Assets Tax Credit Carryforwards Research", "terseLabel": "Research tax credits" } } }, "localname": "DeferredTaxAssetsTaxCreditCarryforwardsResearch", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfFederalAndStateNetOperatingLossesAndResearchTaxCreditsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost": { "auth_ref": [ "r309", "r310" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10090.0, "parentTag": "us-gaap_DeferredTaxAssetsGross", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.", "label": "Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost", "terseLabel": "Stock-based compensation" } } }, "localname": "DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities": { "auth_ref": [ "r309", "r310" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10100.0, "parentTag": "us-gaap_DeferredTaxAssetsGross", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.", "label": "Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities", "terseLabel": "Accrued expense" } } }, "localname": "DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsValuationAllowance": { "auth_ref": [ "r303" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails": { "order": 10060.0, "parentTag": "us-gaap_DeferredTaxAssetsNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.", "label": "Deferred Tax Assets Valuation Allowance", "negatedLabel": "Less: valuation allowance" } } }, "localname": "DeferredTaxAssetsValuationAllowance", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxLiabilitiesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Deferred Tax Liabilities [Abstract]", "terseLabel": "Deferred tax liability" } } }, "localname": "DeferredTaxLiabilitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount": { "auth_ref": [], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of discretionary contributions made by an employer to a defined contribution plan.", "label": "Defined Contribution Plan Employer Discretionary Contribution Amount", "terseLabel": "Defined contribution plan, employer discretionary contribution amount" } } }, "localname": "DefinedContributionPlanEmployerDiscretionaryContributionAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.", "label": "Defined Contribution Plan Employer Matching Contribution Percent", "terseLabel": "Defined contribution plan, employer matching contribution, percent of employee's gross pay" } } }, "localname": "DefinedContributionPlanEmployerMatchingContributionPercent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.", "label": "Defined Contribution Plan Maximum Annual Contributions Per Employee Percent", "terseLabel": "Defined contribution plan, maximum annual contributions per employee, percent" } } }, "localname": "DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DepreciationDepletionAndAmortization": { "auth_ref": [ "r74", "r128" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10150.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.", "label": "Depreciation Depletion And Amortization", "terseLabel": "Depreciation and amortization" } } }, "localname": "DepreciationDepletionAndAmortization", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock": { "auth_ref": [ "r289" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for share-based payment arrangement.", "label": "Disclosure Of Compensation Related Costs Share Based Payments [Text Block]", "terseLabel": "Stock-Based Compensation" } } }, "localname": "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensation" ], "xbrltype": "textBlockItemType" }, "us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]" } } }, "localname": "DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_DomesticCountryMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Designated tax department of the government that is entitled to levy and collect income taxes from the entity in its country of domicile.", "label": "Domestic Country [Member]", "terseLabel": "Federal" } } }, "localname": "DomesticCountryMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfFederalAndStateNetOperatingLossesAndResearchTaxCreditsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EarningsPerShareAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Earnings Per Share [Abstract]", "terseLabel": "Per share information:" } } }, "localname": "EarningsPerShareAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "stringItemType" }, "us-gaap_EarningsPerShareBasicAndDiluted": { "auth_ref": [ "r110" ], "lang": { "en-us": { "role": { "documentation": "The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.", "label": "Earnings Per Share Basic And Diluted", "terseLabel": "Net loss per share of common stock, basic and diluted" } } }, "localname": "EarningsPerShareBasicAndDiluted", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerSharePolicyTextBlock": { "auth_ref": [ "r112", "r113" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.", "label": "Earnings Per Share Policy [Text Block]", "terseLabel": "Net Loss Per Share" } } }, "localname": "EarningsPerSharePolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_EffectiveIncomeTaxRateContinuingOperations": { "auth_ref": [ "r295" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "lang": { "en-us": { "role": { "documentation": "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.", "label": "Effective Income Tax Rate Continuing Operations", "totalLabel": "Effective tax rate" } } }, "localname": "EffectiveIncomeTaxRateContinuingOperations", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]", "terseLabel": "Effective Income Tax Rate Reconciliation, Percent [Abstract]" } } }, "localname": "EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails" ], "xbrltype": "stringItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate": { "auth_ref": [ "r86", "r295", "r318" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails": { "order": 10010.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": 1.0 } }, "lang": { "en-us": { "role": { "documentation": "Percentage of domestic federal statutory tax rate applicable to pretax income (loss).", "label": "Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate", "negatedLabel": "Federal tax benefit at statutory rate" } } }, "localname": "EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance": { "auth_ref": [ "r295", "r318" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails": { "order": 10050.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": 1.0 } }, "lang": { "en-us": { "role": { "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.", "label": "Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance", "negatedLabel": "Change in valuation allowance" } } }, "localname": "EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments": { "auth_ref": [ "r295", "r318" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails": { "order": 10030.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": 1.0 } }, "lang": { "en-us": { "role": { "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.", "label": "Effective Income Tax Rate Reconciliation Other Adjustments", "negatedLabel": "Permanent differences" } } }, "localname": "EffectiveIncomeTaxRateReconciliationOtherAdjustments", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes": { "auth_ref": [ "r295", "r318" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails": { "order": 10020.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": 1.0 } }, "lang": { "en-us": { "role": { "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).", "label": "Effective Income Tax Rate Reconciliation State And Local Income Taxes", "negatedLabel": "State tax, net of federal benefit" } } }, "localname": "EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch": { "auth_ref": [ "r295", "r318" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails": { "order": 10040.0, "parentTag": "us-gaap_EffectiveIncomeTaxRateContinuingOperations", "weight": 1.0 } }, "lang": { "en-us": { "role": { "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.", "label": "Effective Income Tax Rate Reconciliation Tax Credits Research", "negatedLabel": "Research and development" } } }, "localname": "EffectiveIncomeTaxRateReconciliationTaxCreditsResearch", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToEffectiveTaxRateDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements": { "auth_ref": [ "r295", "r318" ], "lang": { "en-us": { "role": { "documentation": "Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.", "label": "Effective Income Tax Rate Reconciliation Tax Settlements", "terseLabel": "Percentage of tax benefit recognized upon settlement" } } }, "localname": "EffectiveIncomeTaxRateReconciliationTaxSettlements", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EmployeeRelatedLiabilitiesCurrent": { "auth_ref": [ "r39" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails": { "order": 10010.0, "parentTag": "us-gaap_AccruedLiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).", "label": "Employee Related Liabilities Current", "terseLabel": "Compensation and related benefits" } } }, "localname": "EmployeeRelatedLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1": { "auth_ref": [ "r275" ], "lang": { "en-us": { "role": { "documentation": "Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1", "terseLabel": "Total unrecognized compensation expense, weighted-average period" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions": { "auth_ref": [ "r275" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.", "label": "Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options", "terseLabel": "Share-based payment arrangement, nonvested award, unrecognized expense" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions": { "auth_ref": [ "r275" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cost to be recognized for option under share-based payment arrangement.", "label": "Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options", "terseLabel": "Total unrecognized compensation expense related to unvested stock option awards" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeStockOptionMember": { "auth_ref": [ "r272" ], "lang": { "en-us": { "role": { "documentation": "Share-based payment arrangement granting right, subject to vesting and other restrictions, to purchase or sell certain number of shares at predetermined price for specified period of time.", "label": "Employee Stock Option [Member]", "terseLabel": "Stock Options" } } }, "localname": "EmployeeStockOptionMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesOfCommonStockOutstandingDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EquipmentMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Tangible personal property used to produce goods and services.", "label": "Equipment [Member]", "terseLabel": "Lab equipment" } } }, "localname": "EquipmentMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentUsefulLifeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EquityAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Equity [Abstract]" } } }, "localname": "EquityAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_EquityComponentDomain": { "auth_ref": [ "r2", "r58", "r59", "r60", "r88", "r89", "r90", "r93", "r100", "r102", "r114", "r161", "r216", "r224", "r282", "r283", "r284", "r314", "r315", "r345", "r366", "r367", "r368", "r369", "r370", "r371", "r435", "r436", "r437", "r485" ], "lang": { "en-us": { "role": { "documentation": "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.", "label": "Equity Component [Domain]", "terseLabel": "Equity Component" } } }, "localname": "EquityComponentDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]", "terseLabel": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]" } } }, "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable": { "auth_ref": [ "r350", "r352" ], "lang": { "en-us": { "role": { "documentation": "Schedule of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets using significant unobservable inputs (level 3). Such reconciliation, separately presenting changes during the period, at a minimum, may include, but is not limited to: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.", "label": "Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Table]", "terseLabel": "Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Table]" } } }, "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByFairValueHierarchyLevelAxis": { "auth_ref": [ "r193", "r194", "r195", "r227", "r228", "r229", "r230", "r231", "r232", "r233", "r234", "r349", "r391", "r392", "r393" ], "lang": { "en-us": { "role": { "documentation": "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.", "label": "Fair Value By Fair Value Hierarchy Level [Axis]", "terseLabel": "Fair Value Hierarchy and NAV" } } }, "localname": "FairValueByFairValueHierarchyLevelAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueDisclosuresAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Fair Value Disclosures [Abstract]" } } }, "localname": "FairValueDisclosuresAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_FairValueDisclosuresTextBlock": { "auth_ref": [ "r351" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.", "label": "Fair Value Disclosures [Text Block]", "terseLabel": "Fair Value of Financial Instruments" } } }, "localname": "FairValueDisclosuresTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstruments" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueInputsLevel1Member": { "auth_ref": [ "r193", "r227", "r228", "r233", "r234", "r349", "r391" ], "lang": { "en-us": { "role": { "documentation": "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.", "label": "Fair Value Inputs Level1 [Member]", "terseLabel": "Quoted Prices in Active Markets for Identical Assets (Level 1)" } } }, "localname": "FairValueInputsLevel1Member", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel2Member": { "auth_ref": [ "r193", "r194", "r195", "r227", "r228", "r233", "r234", "r349", "r392" ], "lang": { "en-us": { "role": { "documentation": "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.", "label": "Fair Value Inputs Level2 [Member]", "terseLabel": "Significant other observable inputs (Level 2)" } } }, "localname": "FairValueInputsLevel2Member", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel3Member": { "auth_ref": [ "r193", "r194", "r195", "r227", "r228", "r229", "r230", "r231", "r232", "r233", "r234", "r349", "r393" ], "lang": { "en-us": { "role": { "documentation": "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.", "label": "Fair Value Inputs Level3 [Member]", "terseLabel": "Significant unobservable inputs (Level 3)" } } }, "localname": "FairValueInputsLevel3Member", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue": { "auth_ref": [ "r350" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.", "label": "Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value", "terseLabel": "Fair value measurement, recurring basis, assets" } } }, "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": { "auth_ref": [ "r193", "r194", "r195", "r227", "r228", "r229", "r230", "r231", "r232", "r233", "r234", "r391", "r392", "r393" ], "lang": { "en-us": { "role": { "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.", "label": "Fair Value Measurements Fair Value Hierarchy [Domain]", "terseLabel": "Fair Value Hierarchy and NAV" } } }, "localname": "FairValueMeasurementsFairValueHierarchyDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueOfFinancialInstrumentsPolicy": { "auth_ref": [ "r353", "r354" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for determining the fair value of financial instruments.", "label": "Fair Value Of Financial Instruments Policy", "terseLabel": "Fair Value of Financial Instruments" } } }, "localname": "FairValueOfFinancialInstrumentsPolicy", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_FinanceLeaseLiabilityPaymentsDue": { "auth_ref": [ "r383" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease.", "label": "Finance Lease Liability Payments Due", "terseLabel": "Lease payments under capital lease" } } }, "localname": "FinanceLeaseLiabilityPaymentsDue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FurnitureAndFixturesMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.", "label": "Furniture And Fixtures [Member]", "terseLabel": "Furniture and fixtures" } } }, "localname": "FurnitureAndFixturesMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentUsefulLifeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_GainLossOnSaleOfPropertyPlantEquipment": { "auth_ref": [ "r74" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10170.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.", "label": "Gain Loss On Sale Of Property Plant Equipment", "negatedLabel": "Loss on disposal of property and equipment" } } }, "localname": "GainLossOnSaleOfPropertyPlantEquipment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_GeneralAndAdministrativeExpense": { "auth_ref": [ "r64" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS": { "order": 10070.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.", "label": "General And Administrative Expense", "terseLabel": "General and administrative" } } }, "localname": "GeneralAndAdministrativeExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "monetaryItemType" }, "us-gaap_GeneralAndAdministrativeExpenseMember": { "auth_ref": [ "r63" ], "lang": { "en-us": { "role": { "documentation": "Primary financial statement caption encompassing general and administrative expense.", "label": "General And Administrative Expense [Member]", "terseLabel": "General and Administrative" } } }, "localname": "GeneralAndAdministrativeExpenseMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseRecordedInStatementsOfOperationsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IPOMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "First sale of stock by a private company to the public.", "label": "I P O [Member]", "terseLabel": "IPO" } } }, "localname": "IPOMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IncomeStatementAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Income Statement [Abstract]" } } }, "localname": "IncomeStatementAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_IncomeStatementLocationAxis": { "auth_ref": [ "r173", "r175" ], "lang": { "en-us": { "role": { "documentation": "Information by location in the income statement.", "label": "Income Statement Location [Axis]", "terseLabel": "Income Statement Location" } } }, "localname": "IncomeStatementLocationAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseRecordedInStatementsOfOperationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeStatementLocationDomain": { "auth_ref": [ "r175" ], "lang": { "en-us": { "role": { "documentation": "Location in the income statement.", "label": "Income Statement Location [Domain]", "terseLabel": "Income Statement Location" } } }, "localname": "IncomeStatementLocationDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseRecordedInStatementsOfOperationsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IncomeTaxAuthorityAxis": { "auth_ref": [ "r298" ], "lang": { "en-us": { "role": { "documentation": "Information by tax jurisdiction.", "label": "Income Tax Authority [Axis]", "terseLabel": "Income Tax Authority" } } }, "localname": "IncomeTaxAuthorityAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfFederalAndStateNetOperatingLossesAndResearchTaxCreditsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxAuthorityDomain": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Agency, division or body classification that levies income taxes, examines tax returns for compliance, or grants exemptions from or makes other decisions pertaining to income taxes.", "label": "Income Tax Authority [Domain]", "terseLabel": "Income Tax Authority" } } }, "localname": "IncomeTaxAuthorityDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfFederalAndStateNetOperatingLossesAndResearchTaxCreditsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IncomeTaxAuthorityNameAxis": { "auth_ref": [ "r298" ], "lang": { "en-us": { "role": { "documentation": "Information by name of taxing authority.", "label": "Income Tax Authority Name [Axis]", "terseLabel": "Income Tax Authority, Name" } } }, "localname": "IncomeTaxAuthorityNameAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxAuthorityNameDomain": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Named agency, division or body that levies income taxes, examines tax returns for compliance, or grants exemptions from or makes other decisions pertaining to income taxes.", "label": "Income Tax Authority Name [Domain]", "terseLabel": "Income Tax Authority, Name" } } }, "localname": "IncomeTaxAuthorityNameDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IncomeTaxDisclosureAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Income Tax Disclosure [Abstract]" } } }, "localname": "IncomeTaxDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxDisclosureTextBlock": { "auth_ref": [ "r86", "r296", "r299", "r306", "r317", "r319", "r320", "r321", "r322" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.", "label": "Income Tax Disclosure [Text Block]", "terseLabel": "Income Taxes" } } }, "localname": "IncomeTaxDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxes" ], "xbrltype": "textBlockItemType" }, "us-gaap_IncomeTaxPolicyTextBlock": { "auth_ref": [ "r57", "r293", "r294", "r299", "r300", "r305", "r311" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.", "label": "Income Tax Policy [Text Block]", "terseLabel": "Income taxes" } } }, "localname": "IncomeTaxPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_IncreaseDecreaseInAccountsPayable": { "auth_ref": [ "r73" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10210.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.", "label": "Increase Decrease In Accounts Payable", "terseLabel": "Accounts payable" } } }, "localname": "IncreaseDecreaseInAccountsPayable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities": { "auth_ref": [ "r73" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10220.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of increase (decrease) in accrued expenses, and obligations classified as other.", "label": "Increase Decrease In Accrued Liabilities And Other Operating Liabilities", "terseLabel": "Accrued expenses and other liabilities" } } }, "localname": "IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Increase Decrease In Operating Capital [Abstract]", "terseLabel": "Changes in operating assets and liabilities:" } } }, "localname": "IncreaseDecreaseInOperatingCapitalAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets": { "auth_ref": [ "r73" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10200.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of increase (decrease) in prepaid expenses, and assets classified as other.", "label": "Increase Decrease In Prepaid Deferred Expense And Other Assets", "negatedLabel": "Prepaid expenses and other current assets" } } }, "localname": "IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_InternalRevenueServiceIRSMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Designated tax department of the United States of America government entitled to levy and collect income taxes from the entity.", "label": "Internal Revenue Service I R S [Member]", "terseLabel": "Internal Revenue Service (IRS)" } } }, "localname": "InternalRevenueServiceIRSMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_InvestmentTypeAxis": { "auth_ref": [ "r446", "r447", "r448", "r449", "r450", "r451", "r452", "r453", "r454", "r455", "r456", "r457", "r458", "r459", "r460" ], "lang": { "en-us": { "role": { "documentation": "Information by type of investments.", "label": "Investment Type [Axis]", "terseLabel": "Investment Type" } } }, "localname": "InvestmentTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_InvestmentTypeCategorizationMember": { "auth_ref": [ "r446", "r447", "r448", "r449", "r450", "r451", "r452", "r453", "r454", "r455", "r456", "r457", "r458", "r459", "r460" ], "lang": { "en-us": { "role": { "documentation": "Asset obtained to generate income or appreciate in value.", "label": "Investment Type Categorization [Member]", "terseLabel": "Investments" } } }, "localname": "InvestmentTypeCategorizationMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Investments Debt And Equity Securities [Abstract]" } } }, "localname": "InvestmentsDebtAndEquitySecuritiesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock": { "auth_ref": [ "r153", "r406", "r417", "r461", "r477" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for investments in certain debt and equity securities.", "label": "Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosure [Text Block]", "terseLabel": "Investments" } } }, "localname": "InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecurities" ], "xbrltype": "textBlockItemType" }, "us-gaap_LeaseContractualTermAxis": { "auth_ref": [ "r380" ], "lang": { "en-us": { "role": { "documentation": "Information by contractual term of lease arrangement.", "label": "Lease Contractual Term [Axis]", "terseLabel": "Lease Contractual Term" } } }, "localname": "LeaseContractualTermAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsTables" ], "xbrltype": "stringItemType" }, "us-gaap_LeaseContractualTermDomain": { "auth_ref": [ "r380" ], "lang": { "en-us": { "role": { "documentation": "Contractual term of lease arrangement.", "label": "Lease Contractual Term [Domain]", "terseLabel": "Lease Contractual Term" } } }, "localname": "LeaseContractualTermDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsTables" ], "xbrltype": "domainItemType" }, "us-gaap_LeaseExpirationDate1": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Date which lease or group of leases is set to expire, in YYYY-MM-DD format.", "label": "Lease Expiration Date1", "terseLabel": "Lease expiration date" } } }, "localname": "LeaseExpirationDate1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "dateItemType" }, "us-gaap_LeaseholdImprovementsMember": { "auth_ref": [ "r169" ], "lang": { "en-us": { "role": { "documentation": "Additions or improvements to assets held under a lease arrangement.", "label": "Leasehold Improvements [Member]", "terseLabel": "Leasehold improvements" } } }, "localname": "LeaseholdImprovementsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock": { "auth_ref": [ "r383" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.", "label": "Lessee Operating Lease Liability Maturity Table [Text Block]", "terseLabel": "Schedule of Future Minimum Lease Payments Under Lease" } } }, "localname": "LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue": { "auth_ref": [ "r383" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails2": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease.", "label": "Lessee Operating Lease Liability Payments Due", "totalLabel": "Total undiscounted lease payments" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive": { "auth_ref": [ "r383" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).", "label": "Lessee Operating Lease Liability Payments Due After Year Five", "terseLabel": "Thereafter" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths": { "auth_ref": [ "r383" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails": { "order": 10010.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).", "label": "Lessee Operating Lease Liability Payments Due Next Twelve Months", "terseLabel": "2022", "verboseLabel": "Operating lease payments due in 2022" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive": { "auth_ref": [ "r383" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).", "label": "Lessee Operating Lease Liability Payments Due Year Five", "terseLabel": "2026" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFive", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour": { "auth_ref": [ "r383" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).", "label": "Lessee Operating Lease Liability Payments Due Year Four", "terseLabel": "2025" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFour", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree": { "auth_ref": [ "r383" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).", "label": "Lessee Operating Lease Liability Payments Due Year Three", "terseLabel": "2024" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearThree", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo": { "auth_ref": [ "r383" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).", "label": "Lessee Operating Lease Liability Payments Due Year Two", "terseLabel": "2023" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount": { "auth_ref": [ "r383" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails2": { "order": 10010.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.", "label": "Lessee Operating Lease Liability Undiscounted Excess Amount", "negatedLabel": "Less imputed interest" } } }, "localname": "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseOptionToExtend": { "auth_ref": [ "r379" ], "lang": { "en-us": { "role": { "documentation": "Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.", "label": "Lessee Operating Lease Option To Extend", "terseLabel": "Lessee, operating lease, option to extend" } } }, "localname": "LesseeOperatingLeaseOptionToExtend", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeOperatingLeaseRenewalTerm": { "auth_ref": [ "r379" ], "lang": { "en-us": { "role": { "documentation": "Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Lessee Operating Lease Renewal Term", "terseLabel": "Lease renewal period" } } }, "localname": "LesseeOperatingLeaseRenewalTerm", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_LetterOfCreditMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "A document typically issued by a financial institution which acts as a guarantee of payment to a beneficiary, or as the source of payment for a specific transaction (for example, wiring funds to a foreign exporter if and when specified merchandise is accepted pursuant to the terms of the letter of credit).", "label": "Letter Of Credit [Member]", "terseLabel": "Letter of Credit" } } }, "localname": "LetterOfCreditMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_Liabilities": { "auth_ref": [ "r37", "r85", "r138", "r154", "r181", "r182", "r183", "r185", "r186", "r187", "r188", "r189", "r190", "r191", "r327", "r332", "r333", "r355", "r386", "r387" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10010.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.", "label": "Liabilities", "totalLabel": "Total liabilities" } } }, "localname": "Liabilities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquity": { "auth_ref": [ "r28", "r85", "r154", "r355", "r388", "r411", "r426" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.", "label": "Liabilities And Stockholders Equity", "totalLabel": "Total liabilities and stockholders\u2019 equity" } } }, "localname": "LiabilitiesAndStockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Liabilities And Stockholders Equity [Abstract]", "terseLabel": "Liabilities and stockholders\u2019 equity" } } }, "localname": "LiabilitiesAndStockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_LiabilitiesCurrent": { "auth_ref": [ "r40", "r85", "r154", "r181", "r182", "r183", "r185", "r186", "r187", "r188", "r189", "r190", "r191", "r327", "r332", "r333", "r355", "r386", "r387", "r388" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10090.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.", "label": "Liabilities Current", "totalLabel": "Total current liabilities" } } }, "localname": "LiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesCurrentAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Liabilities Current [Abstract]", "terseLabel": "Current liabilities:" } } }, "localname": "LiabilitiesCurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_MarketableSecuritiesCurrent": { "auth_ref": [ "r7", "r38" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10200.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of investment in marketable security, classified as current.", "label": "Marketable Securities Current", "terseLabel": "Marketable securities" } } }, "localname": "MarketableSecuritiesCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_MarketableSecuritiesLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Marketable Securities [Line Items]", "terseLabel": "Marketable Securities [Line Items]" } } }, "localname": "MarketableSecuritiesLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_MarketableSecuritiesPolicy": { "auth_ref": [ "r416" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for investment classified as marketable security.", "label": "Marketable Securities Policy", "terseLabel": "Marketable Securities" } } }, "localname": "MarketableSecuritiesPolicy", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_MarketableSecuritiesTable": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Disclosure of information about investment in marketable security.", "label": "Marketable Securities [Table]", "terseLabel": "Marketable Securities [Table]" } } }, "localname": "MarketableSecuritiesTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesScheduleOfMarketableSecuritiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_MarketableSecuritiesTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.", "label": "Marketable Securities [Text Block]", "terseLabel": "Schedule of Marketable Securities" } } }, "localname": "MarketableSecuritiesTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureMarketableSecuritiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_MoneyMarketFundsMember": { "auth_ref": [ "r227" ], "lang": { "en-us": { "role": { "documentation": "Fund that invests in short-term money-market instruments, for example, but not limited to, commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid securities.", "label": "Money Market Funds [Member]", "terseLabel": "Money Market Funds" } } }, "localname": "MoneyMarketFundsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_NatureOfOperations": { "auth_ref": [ "r118", "r127" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.", "label": "Nature Of Operations", "terseLabel": "Nature of Operations" } } }, "localname": "NatureOfOperations", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureNatureOfOperations" ], "xbrltype": "textBlockItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivities": { "auth_ref": [ "r71" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10030.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.", "label": "Net Cash Provided By Used In Financing Activities", "totalLabel": "Net cash provided by financing activities" } } }, "localname": "NetCashProvidedByUsedInFinancingActivities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Net Cash Provided By Used In Financing Activities [Abstract]", "terseLabel": "Cash flows provided by financing activities:" } } }, "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivities": { "auth_ref": [ "r71" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10020.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.", "label": "Net Cash Provided By Used In Investing Activities", "totalLabel": "Net cash used in investing activities" } } }, "localname": "NetCashProvidedByUsedInInvestingActivities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Net Cash Provided By Used In Investing Activities [Abstract]", "terseLabel": "Cash flows used in investing activities:" } } }, "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivities": { "auth_ref": [ "r71", "r72", "r75" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10010.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "weight": 1.0 } }, "lang": { "en-us": { "role": { "documentation": "Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.", "label": "Net Cash Provided By Used In Operating Activities", "totalLabel": "Net cash used in operating activities" } } }, "localname": "NetCashProvidedByUsedInOperatingActivities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Net Cash Provided By Used In Operating Activities [Abstract]", "terseLabel": "Cash flows used in operating activities:" } } }, "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_NetIncomeLoss": { "auth_ref": [ "r5", "r52", "r54", "r60", "r61", "r75", "r85", "r92", "r96", "r97", "r98", "r99", "r101", "r102", "r108", "r129", "r136", "r139", "r140", "r142", "r154", "r181", "r182", "r183", "r185", "r186", "r187", "r188", "r189", "r190", "r191", "r347", "r355", "r413", "r429" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS": { "order": 10010.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.", "label": "Net Income Loss", "terseLabel": "Net loss", "totalLabel": "Net loss" } } }, "localname": "NetIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "monetaryItemType" }, "us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.", "label": "New Accounting Pronouncements Policy Policy [Text Block]", "terseLabel": "Recently Issued Accounting Pronouncements" } } }, "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock": { "auth_ref": [ "r248" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of the changes in outstanding nonvested restricted stock shares.", "label": "Nonvested Restricted Stock Shares Activity Table [Text Block]", "terseLabel": "Summary of Activity related to RSA Stock-Based Payment Awards" } } }, "localname": "NonvestedRestrictedStockSharesActivityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_NonvotingCommonStockMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Common stock securities that do not empower a holder to vote on corporate resolutions or the election of directors.", "label": "Nonvoting Common Stock [Member]", "terseLabel": "Non-voting Common Stock" } } }, "localname": "NonvotingCommonStockMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "domainItemType" }, "us-gaap_OperatingExpenses": { "auth_ref": [], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS": { "order": 10050.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.", "label": "Operating Expenses", "totalLabel": "Total operating expenses" } } }, "localname": "OperatingExpenses", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingExpensesAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Operating Expenses [Abstract]", "terseLabel": "Operating expenses:" } } }, "localname": "OperatingExpensesAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "stringItemType" }, "us-gaap_OperatingIncomeLoss": { "auth_ref": [ "r129", "r136", "r139", "r140", "r142" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS": { "order": 10030.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The net result for the period of deducting operating expenses from operating revenues.", "label": "Operating Income Loss", "totalLabel": "Loss from operations" } } }, "localname": "OperatingIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseExpense": { "auth_ref": [ "r378" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of operating lease expense. Excludes sublease income.", "label": "Operating Lease Expense", "terseLabel": "Rent expense" } } }, "localname": "OperatingLeaseExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseLiability": { "auth_ref": [ "r376" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease.", "label": "Operating Lease Liability", "terseLabel": "Operating lease liability" } } }, "localname": "OperatingLeaseLiability", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseLiabilityCurrent": { "auth_ref": [ "r376" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails2": { "order": 10020.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 }, "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10130.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.", "label": "Operating Lease Liability Current", "terseLabel": "Operating lease liability" } } }, "localname": "OperatingLeaseLiabilityCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsScheduleOfFutureMinimumLeasePaymentsUnderLeaseDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseRightOfUseAsset": { "auth_ref": [ "r375" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10170.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of lessee's right to use underlying asset under operating lease.", "label": "Operating Lease Right Of Use Asset", "terseLabel": "Right-of-use asset" } } }, "localname": "OperatingLeaseRightOfUseAsset", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense": { "auth_ref": [ "r74" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10160.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of amortization expense for right-of-use asset from operating lease.", "label": "Operating Lease Right Of Use Asset Amortization Expense", "terseLabel": "Noncash lease expense" } } }, "localname": "OperatingLeaseRightOfUseAssetAmortizationExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLossCarryforwardsLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Operating Loss Carryforwards [Line Items]", "terseLabel": "Operating Loss Carryforwards [Line Items]" } } }, "localname": "OperatingLossCarryforwardsLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfFederalAndStateNetOperatingLossesAndResearchTaxCreditsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OperatingLossCarryforwardsTable": { "auth_ref": [ "r308" ], "lang": { "en-us": { "role": { "documentation": "Schedule reflecting pertinent information, such as tax authority, amounts, and expiration dates, of net operating loss carryforwards, including an assessment of the likelihood of utilization.", "label": "Operating Loss Carryforwards [Table]", "terseLabel": "Operating Loss Carryforwards [Table]" } } }, "localname": "OperatingLossCarryforwardsTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfFederalAndStateNetOperatingLossesAndResearchTaxCreditsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Organization Consolidation And Presentation Of Financial Statements [Abstract]" } } }, "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_OtherAccruedLiabilitiesCurrent": { "auth_ref": [ "r10", "r11", "r12", "r39" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails": { "order": 10030.0, "parentTag": "us-gaap_AccruedLiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.", "label": "Other Accrued Liabilities Current", "terseLabel": "Other" } } }, "localname": "OtherAccruedLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherAssets": { "auth_ref": [ "r16", "r408", "r421" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10180.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of assets classified as other.", "label": "Other Assets", "terseLabel": "Other assets" } } }, "localname": "OtherAssets", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherCommitmentsLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Other Commitments [Line Items]", "terseLabel": "Other Commitments [Line Items]" } } }, "localname": "OtherCommitmentsLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OtherCommitmentsTable": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Disclosure of information about obligations resulting from other commitments.", "label": "Other Commitments [Table]", "terseLabel": "Other Commitments [Table]" } } }, "localname": "OtherCommitmentsTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent": { "auth_ref": [ "r324", "r325", "r330" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS": { "order": 10020.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.", "label": "Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent", "terseLabel": "Unrealized gain (loss) on marketable securities, net of tax" } } }, "localname": "OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract]", "terseLabel": "Comprehensive loss" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "stringItemType" }, "us-gaap_OtherLiabilitiesNoncurrent": { "auth_ref": [ "r41" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10100.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.", "label": "Other Liabilities Noncurrent", "terseLabel": "Other liabilities" } } }, "localname": "OtherLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherNonoperatingIncomeExpense": { "auth_ref": [ "r65" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS": { "order": 10040.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of income (expense) related to nonoperating activities, classified as other.", "label": "Other Nonoperating Income Expense", "terseLabel": "Other income, net" } } }, "localname": "OtherNonoperatingIncomeExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PayablesAndAccrualsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Payables And Accruals [Abstract]" } } }, "localname": "PayablesAndAccrualsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_PaymentsOfStockIssuanceCosts": { "auth_ref": [ "r69" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10080.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The cash outflow for cost incurred directly with the issuance of an equity security.", "label": "Payments Of Stock Issuance Costs", "negatedLabel": "Payment of offering costs" } } }, "localname": "PaymentsOfStockIssuanceCosts", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireMarketableSecurities": { "auth_ref": [ "r148" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10120.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of cash outflow for purchase of marketable security.", "label": "Payments To Acquire Marketable Securities", "negatedLabel": "Purchases of marketable securities" } } }, "localname": "PaymentsToAcquireMarketableSecurities", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": { "auth_ref": [ "r66" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10130.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.", "label": "Payments To Acquire Property Plant And Equipment", "negatedLabel": "Purchases of property and equipment" } } }, "localname": "PaymentsToAcquirePropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PlanNameAxis": { "auth_ref": [ "r241", "r276" ], "lang": { "en-us": { "role": { "documentation": "Information by plan name for share-based payment arrangement.", "label": "Plan Name [Axis]", "terseLabel": "Plan Name" } } }, "localname": "PlanNameAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PlanNameDomain": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Plan name for share-based payment arrangement.", "label": "Plan Name [Domain]", "terseLabel": "Plan Name" } } }, "localname": "PlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PrepaidExpenseAndOtherAssetsCurrent": { "auth_ref": [ "r8", "r29", "r30" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10210.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.", "label": "Prepaid Expense And Other Assets Current", "terseLabel": "Prepaid expenses and other current assets" } } }, "localname": "PrepaidExpenseAndOtherAssetsCurrent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceInitialPublicOffering": { "auth_ref": [ "r67" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10050.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The cash inflow associated with the amount received from entity's first offering of stock to the public.", "label": "Proceeds From Issuance Initial Public Offering", "terseLabel": "Proceeds from the issuance of common stock upon initial public offering, net of offering costs" } } }, "localname": "ProceedsFromIssuanceInitialPublicOffering", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfCommonStock": { "auth_ref": [ "r67" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10040.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The cash inflow from the additional capital contribution to the entity.", "label": "Proceeds From Issuance Of Common Stock", "terseLabel": "Proceeds from the sale of common stock, net of offering costs" } } }, "localname": "ProceedsFromIssuanceOfCommonStock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock": { "auth_ref": [ "r67" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10060.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock.", "label": "Proceeds From Issuance Of Convertible Preferred Stock", "terseLabel": "Proceeds from the sale of convertible preferred stock, net of offering costs", "verboseLabel": "Net proceeds from issuance of preferred stock" } } }, "localname": "ProceedsFromIssuanceOfConvertiblePreferredStock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromStockOptionsExercised": { "auth_ref": [ "r67", "r277" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10100.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cash inflow from exercise of option under share-based payment arrangement.", "label": "Proceeds From Stock Options Exercised", "terseLabel": "Proceeds from issuance of common stock in connection with the exercise of stock options" } } }, "localname": "ProceedsFromStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromStockPlans": { "auth_ref": [ "r67" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10110.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The cash inflow associated with the amount received from the stock plan during the period.", "label": "Proceeds From Stock Plans", "terseLabel": "Proceeds from the issuance of common stock under ESPP" } } }, "localname": "ProceedsFromStockPlans", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProfitLoss": { "auth_ref": [ "r5", "r52", "r54", "r60", "r70", "r85", "r92", "r101", "r102", "r129", "r136", "r139", "r140", "r142", "r154", "r181", "r182", "r183", "r185", "r186", "r187", "r188", "r189", "r190", "r191", "r324", "r328", "r329", "r334", "r335", "r347", "r355", "r415" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10140.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.", "label": "Profit Loss", "terseLabel": "Net loss" } } }, "localname": "ProfitLoss", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Property Plant And Equipment [Abstract]" } } }, "localname": "PropertyPlantAndEquipmentAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization": { "auth_ref": [ "r170", "r377", "r381" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.", "label": "Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization", "terseLabel": "Accumulated amortization related to the capital lease" } } }, "localname": "PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization": { "auth_ref": [ "r47", "r172", "r381" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.", "label": "Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization", "terseLabel": "Capital lease" } } }, "localname": "PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentByTypeAxis": { "auth_ref": [ "r34", "r172" ], "lang": { "en-us": { "role": { "documentation": "Information by type of long-lived, physical assets used to produce goods and services and not intended for resale.", "label": "Property Plant And Equipment By Type [Axis]", "terseLabel": "Long-Lived Tangible Asset" } } }, "localname": "PropertyPlantAndEquipmentByTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentUsefulLifeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentDepreciationMethods": { "auth_ref": [ "r171" ], "lang": { "en-us": { "role": { "documentation": "Description of the methodology for computing depreciation for classes of depreciable assets.", "label": "Property Plant And Equipment Depreciation Methods", "terseLabel": "Depreciation expense description" } } }, "localname": "PropertyPlantAndEquipmentDepreciationMethods", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock": { "auth_ref": [ "r174", "r462", "r463", "r464" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections.", "label": "Property Plant And Equipment Disclosure [Text Block]", "terseLabel": "Property and Equipment" } } }, "localname": "PropertyPlantAndEquipmentDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipment" ], "xbrltype": "textBlockItemType" }, "us-gaap_PropertyPlantAndEquipmentGross": { "auth_ref": [ "r33", "r169" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails": { "order": 10010.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.", "label": "Property Plant And Equipment Gross", "terseLabel": "Property, plant and equipment, gross" } } }, "localname": "PropertyPlantAndEquipmentGross", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Property Plant And Equipment [Line Items]", "terseLabel": "Property, Plant and Equipment [Line Items]" } } }, "localname": "PropertyPlantAndEquipmentLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentUsefulLifeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentNet": { "auth_ref": [ "r14", "r15", "r172", "r388", "r418", "r427" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10160.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.", "label": "Property Plant And Equipment Net", "terseLabel": "Property and equipment, net", "totalLabel": "Property and equipment, net" } } }, "localname": "PropertyPlantAndEquipmentNet", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentPolicyTextBlock": { "auth_ref": [ "r32", "r172", "r462", "r463" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections.", "label": "Property Plant And Equipment Policy [Text Block]", "terseLabel": "Property and Equipment" } } }, "localname": "PropertyPlantAndEquipmentPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_PropertyPlantAndEquipmentTextBlock": { "auth_ref": [ "r14", "r172" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.", "label": "Property Plant And Equipment [Text Block]", "terseLabel": "Schedule of Property and Equipment" } } }, "localname": "PropertyPlantAndEquipmentTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_PropertyPlantAndEquipmentTypeDomain": { "auth_ref": [ "r14", "r169" ], "lang": { "en-us": { "role": { "documentation": "Listing of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.", "label": "Property Plant And Equipment Type [Domain]", "terseLabel": "Long-Lived Tangible Asset" } } }, "localname": "PropertyPlantAndEquipmentTypeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentUsefulLifeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PropertyPlantAndEquipmentUsefulLife": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.", "label": "Property Plant And Equipment Useful Life", "terseLabel": "Property, plant and equipment, useful life" } } }, "localname": "PropertyPlantAndEquipmentUsefulLife", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentUsefulLifeDetails" ], "xbrltype": "durationItemType" }, "us-gaap_RepaymentsOfLongTermCapitalLeaseObligations": { "auth_ref": [ "r68" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10090.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).", "label": "Repayments Of Long Term Capital Lease Obligations", "negatedLabel": "Payment of capital lease obligation" } } }, "localname": "RepaymentsOfLongTermCapitalLeaseObligations", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross": { "auth_ref": [ "r291", "r292" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The amount of costs incurred under a research and development arrangement accounted for as a contract to perform research and development for others.", "label": "Research And Development Arrangement Contract To Perform For Others Costs Incurred Gross", "terseLabel": "Agreement is eligible to receive payment in future research, development and regulatory milestones" } } }, "localname": "ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ResearchAndDevelopmentExpense": { "auth_ref": [ "r290", "r401", "r467" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS": { "order": 10060.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.", "label": "Research And Development Expense", "terseLabel": "Research and development" } } }, "localname": "ResearchAndDevelopmentExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ResearchAndDevelopmentExpenseMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Primary financial statement caption in which the reported facts about research and development expense have been included.", "label": "Research And Development Expense [Member]", "terseLabel": "Research and Development" } } }, "localname": "ResearchAndDevelopmentExpenseMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseRecordedInStatementsOfOperationsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ResearchAndDevelopmentExpensePolicy": { "auth_ref": [ "r290" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for costs it has incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process.", "label": "Research And Development Expense Policy", "terseLabel": "Research and Development" } } }, "localname": "ResearchAndDevelopmentExpensePolicy", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_RestrictedCash": { "auth_ref": [ "r81", "r407", "r423" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfReconciliationOfCashAndCashEquivalentsAndRestrictedCashDetails": { "order": 10020.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "weight": 1.0 }, "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10150.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.", "label": "Restricted Cash", "terseLabel": "Restricted cash" } } }, "localname": "RestrictedCash", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfReconciliationOfCashAndCashEquivalentsAndRestrictedCashDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Type of cash and cash equivalent. Cash is currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member]", "terseLabel": "Cash and Cash Equivalents" } } }, "localname": "RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RestrictedStockMember": { "auth_ref": [ "r112" ], "lang": { "en-us": { "role": { "documentation": "Stock including a provision that prohibits sale or substantive sale of an equity instrument for a specified period of time or until specified performance conditions are met.", "label": "Restricted Stock [Member]", "terseLabel": "Restricted Stock Awards", "verboseLabel": "Unvested Restricted Stock Awards" } } }, "localname": "RestrictedStockMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesOfCommonStockOutstandingDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RestrictedStockUnitsRSUMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met.", "label": "Restricted Stock Units R S U [Member]", "terseLabel": "Unvested Restricted Stock Units", "verboseLabel": "Restricted Stock Units" } } }, "localname": "RestrictedStockUnitsRSUMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesOfCommonStockOutstandingDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RetainedEarningsAccumulatedDeficit": { "auth_ref": [ "r24", "r224", "r285", "r388", "r425", "r439", "r444" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10080.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.", "label": "Retained Earnings Accumulated Deficit", "terseLabel": "Accumulated deficit" } } }, "localname": "RetainedEarningsAccumulatedDeficit", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureRisksAndLiquidityAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_RetainedEarningsMember": { "auth_ref": [ "r2", "r88", "r89", "r90", "r93", "r100", "r102", "r161", "r282", "r283", "r284", "r314", "r315", "r345", "r435", "r437" ], "lang": { "en-us": { "role": { "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.", "label": "Retained Earnings [Member]", "terseLabel": "Accumulated Deficit" } } }, "localname": "RetainedEarningsMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "domainItemType" }, "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability": { "auth_ref": [ "r382", "r384" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of increase in right-of-use asset obtained in exchange for operating lease liability.", "label": "Right Of Use Asset Obtained In Exchange For Operating Lease Liability", "terseLabel": "Operating lease right-of-use assets obtained in exchange for operating lease liabilities" } } }, "localname": "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_SaleOfStockNameOfTransactionDomain": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Sale of the entity's stock, including, but not limited to, initial public offering (IPO) and private placement.", "label": "Sale Of Stock Name Of Transaction [Domain]", "terseLabel": "Sale of Stock" } } }, "localname": "SaleOfStockNameOfTransactionDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.", "label": "Sale Of Stock Number Of Shares Issued In Transaction", "terseLabel": "Number of shares sold" } } }, "localname": "SaleOfStockNumberOfSharesIssuedInTransaction", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_SaleOfStockPricePerShare": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.", "label": "Sale Of Stock Price Per Share", "terseLabel": "Public offering price" } } }, "localname": "SaleOfStockPricePerShare", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable": { "auth_ref": [ "r112" ], "lang": { "en-us": { "role": { "documentation": "Schedule for securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities.", "label": "Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table]", "terseLabel": "Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table]" } } }, "localname": "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedWeightedAverageSharesOfCommonStockOutstandingDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock": { "auth_ref": [ "r112" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.", "label": "Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block]", "terseLabel": "Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-average Shares of Common Stock Outstanding" } } }, "localname": "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of the components of cash and cash equivalents.", "label": "Schedule Of Cash And Cash Equivalents Table [Text Block]", "terseLabel": "Schedule of Reconciliation of Cash and Cash Equivalents and Restricted Cash" } } }, "localname": "ScheduleOfCashAndCashEquivalentsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock": { "auth_ref": [ "r273" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.", "label": "Schedule Of Compensation Cost For Share Based Payment Arrangements Allocation Of Share Based Compensation Costs By Plan Table [Text Block]", "terseLabel": "Schedule of Stock-Based Compensation Expense Recorded in Statements of Operations" } } }, "localname": "ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock": { "auth_ref": [ "r304" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.", "label": "Schedule Of Deferred Tax Assets And Liabilities Table [Text Block]", "terseLabel": "Schedule of Deferred Tax Assets and Liabilities" } } }, "localname": "ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock": { "auth_ref": [ "r295" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.", "label": "Schedule Of Effective Income Tax Rate Reconciliation Table [Text Block]", "terseLabel": "Schedule of Reconciliation of the Federal Income tax Rate to Effective Tax Rate" } } }, "localname": "ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock": { "auth_ref": [ "r348", "r349" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).", "label": "Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block]", "terseLabel": "Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis" } } }, "localname": "ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureFairValueOfFinancialInstrumentsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock": { "auth_ref": [ "r255" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of the changes in outstanding nonvested restricted stock units.", "label": "Schedule Of Nonvested Restricted Stock Units Activity Table [Text Block]", "terseLabel": "Summary of Activity related to RSU Stock-Based Payment Awards" } } }, "localname": "ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfPropertyPlantAndEquipmentTable": { "auth_ref": [ "r34", "r172" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of information about physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.", "label": "Schedule Of Property Plant And Equipment [Table]", "terseLabel": "Schedule Of Property Plant And Equipment [Table]" } } }, "localname": "ScheduleOfPropertyPlantAndEquipmentTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentUsefulLifeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable": { "auth_ref": [ "r241", "r276" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of information about share-based payment arrangement.", "label": "Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]", "terseLabel": "Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]" } } }, "localname": "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseRecordedInStatementsOfOperationsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock": { "auth_ref": [ "r276" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.", "label": "Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Text Block]", "terseLabel": "Summary of Information about Stock Options Outstanding" } } }, "localname": "ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock": { "auth_ref": [ "r249", "r261", "r264" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.", "label": "Schedule Of Share Based Compensation Stock Options Activity Table [Text Block]", "terseLabel": "Summary of Stock Option Activity" } } }, "localname": "ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock": { "auth_ref": [ "r267" ], "lang": { "en-us": { "role": { "documentation": "Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.", "label": "Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block]", "terseLabel": "Schedule of Fair Value of Each Option Estimated on Date of Grant Using Weighted Average Assumptions" } } }, "localname": "ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfStockByClassTable": { "auth_ref": [ "r43", "r83", "r115", "r116", "r196", "r197", "r198", "r199", "r200", "r201", "r202", "r204", "r208", "r214", "r217", "r218", "r219", "r221", "r222", "r223", "r224" ], "lang": { "en-us": { "role": { "documentation": "Schedule detailing information related to equity by class of stock. Class of stock includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. It also includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity.", "label": "Schedule Of Stock By Class [Table]", "terseLabel": "Schedule Of Stock By Class [Table]" } } }, "localname": "ScheduleOfStockByClassTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SecurityDeposit": { "auth_ref": [ "r45" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.", "label": "Security Deposit", "terseLabel": "Security deposit" } } }, "localname": "SecurityDeposit", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_SegmentReportingPolicyPolicyTextBlock": { "auth_ref": [ "r130", "r131", "r132", "r133", "r134", "r135", "r143" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for segment reporting.", "label": "Segment Reporting Policy Policy [Text Block]", "terseLabel": "Segment Information" } } }, "localname": "SegmentReportingPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ShareBasedCompensation": { "auth_ref": [ "r73" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS": { "order": 10180.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of noncash expense for share-based payment arrangement.", "label": "Share Based Compensation", "terseLabel": "Stock-based compensation" } } }, "localname": "ShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1": { "auth_ref": [ "r243" ], "lang": { "en-us": { "role": { "documentation": "Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1", "terseLabel": "Award vesting period" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod": { "auth_ref": [ "r254" ], "lang": { "en-us": { "role": { "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period", "negatedLabel": "Number of shares, Forfeited" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue": { "auth_ref": [ "r259" ], "lang": { "en-us": { "role": { "documentation": "Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value", "terseLabel": "Weighted-average grant date fair value, Forfeited" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod": { "auth_ref": [ "r257" ], "lang": { "en-us": { "role": { "documentation": "The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period", "terseLabel": "Number of shares, Granted" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue": { "auth_ref": [ "r257" ], "lang": { "en-us": { "role": { "documentation": "The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value", "terseLabel": "Weighted-average grant date fair value, Granted" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber": { "auth_ref": [ "r256" ], "lang": { "en-us": { "role": { "documentation": "The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number", "periodEndLabel": "Number of shares, Unvested balance at end of period", "periodStartLabel": "Number of shares, Unvested balance at beginning of period" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue": { "auth_ref": [ "r256" ], "lang": { "en-us": { "role": { "documentation": "Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value", "periodEndLabel": "Weighted-average grant date fair value, Unvested balance at end of period", "periodStartLabel": "Weighted-average grant date fair value, Unvested balance at beginning of period" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod": { "auth_ref": [ "r258" ], "lang": { "en-us": { "role": { "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period", "negatedLabel": "Number of shares, Vested" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue": { "auth_ref": [ "r258" ], "lang": { "en-us": { "role": { "documentation": "The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value", "terseLabel": "Weighted-average grant date fair value, Vested" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate": { "auth_ref": [ "r270" ], "lang": { "en-us": { "role": { "documentation": "The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate", "terseLabel": "Expected dividend yield" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate": { "auth_ref": [ "r269" ], "lang": { "en-us": { "role": { "documentation": "The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate", "terseLabel": "Expected volatility" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate": { "auth_ref": [ "r271" ], "lang": { "en-us": { "role": { "documentation": "The risk-free interest rate assumption that is used in valuing an option on its own shares.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate", "terseLabel": "Risk-free interest rate" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Share Based Compensation Arrangement By Share Based Payment Award [Line Items]", "terseLabel": "Share Based Compensation Arrangement By Share Based Payment Award [Line Items]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfStockBasedCompensationExpenseRecordedInStatementsOfOperationsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized": { "auth_ref": [ "r245" ], "lang": { "en-us": { "role": { "documentation": "Number of shares authorized for issuance under share-based payment arrangement.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized", "terseLabel": "Number of shares authorized" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant": { "auth_ref": [ "r276" ], "lang": { "en-us": { "role": { "documentation": "The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant", "terseLabel": "Number of shares available for future grants" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber": { "auth_ref": [ "r252" ], "lang": { "en-us": { "role": { "documentation": "The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number", "terseLabel": "Number of shares, Exercisable at December 31, 2021" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice": { "auth_ref": [ "r252" ], "lang": { "en-us": { "role": { "documentation": "The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price", "terseLabel": "Weighted average exercise price per share, Exercisable at December 31, 2021" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue": { "auth_ref": [ "r263" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value", "terseLabel": "Aggregate intrinsic value of options exercised" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod": { "auth_ref": [ "r254" ], "lang": { "en-us": { "role": { "documentation": "The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period", "negatedLabel": "Number of shares, Forfeited" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Gross number of share options (or share units) granted during the period.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross", "terseLabel": "Number of shares, Granted" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue": { "auth_ref": [ "r262" ], "lang": { "en-us": { "role": { "documentation": "The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value", "terseLabel": "Weighted-average grant date fair value of options granted" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue": { "auth_ref": [ "r276" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value", "terseLabel": "Aggregate intrinsic value of outstanding options" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber": { "auth_ref": [ "r251", "r276" ], "lang": { "en-us": { "role": { "documentation": "Number of options outstanding, including both vested and non-vested options.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number", "periodEndLabel": "Number of shares, Outstanding at end of period", "periodStartLabel": "Number of shares, Outstanding at beginning of period" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice": { "auth_ref": [ "r250" ], "lang": { "en-us": { "role": { "documentation": "Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price", "periodEndLabel": "Weighted average exercise price per share, Outstanding at end of period", "periodStartLabel": "Weighted average exercise price per share, Outstanding at beginning of period" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod": { "auth_ref": [ "r276" ], "lang": { "en-us": { "role": { "documentation": "Number of shares issued under share-based payment arrangement.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period", "terseLabel": "Shares issued" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward": { "auth_ref": [ "r242" ], "lang": { "en-us": { "role": { "documentation": "Description of terms of award under share-based payment arrangement.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Terms Of Award", "terseLabel": "Terms of award" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": { "auth_ref": [ "r238", "r246" ], "lang": { "en-us": { "role": { "documentation": "Award under share-based payment arrangement.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain]", "terseLabel": "Award Type" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSAStockBasedPaymentAwardsDetails", "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityRelatedToRSUStockBasedPaymentAwardsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Weighted average price at which option holders acquired shares when converting their stock options into shares.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price", "terseLabel": "Weighted average exercise price per share, Exercised" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price", "terseLabel": "Weighted average exercise price per share, Forfeited" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price", "terseLabel": "Weighted average exercise price per share, Granted" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationAwardTrancheOneMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "First portion of award under share-based payment arrangement differentiated by vesting feature, including, but not limited to, performance measure or service period.", "label": "Share Based Compensation Award Tranche One [Member]", "terseLabel": "Vesting After One Year" } } }, "localname": "ShareBasedCompensationAwardTrancheOneMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis": { "auth_ref": [ "r266" ], "lang": { "en-us": { "role": { "documentation": "Information by range of option prices pertaining to options granted.", "label": "Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Axis]", "terseLabel": "Exercise Price Range" } } }, "localname": "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain": { "auth_ref": [ "r272" ], "lang": { "en-us": { "role": { "documentation": "Supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by ranges of exercise prices.", "label": "Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Domain]", "terseLabel": "Exercise Price Range" } } }, "localname": "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit": { "auth_ref": [ "r272" ], "lang": { "en-us": { "role": { "documentation": "The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.", "label": "Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit", "terseLabel": "Range of Exercise Prices, Minimum" } } }, "localname": "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions": { "auth_ref": [ "r260" ], "lang": { "en-us": { "role": { "documentation": "The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.", "label": "Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options", "terseLabel": "Options Exercisable, Number Exercisable" } } }, "localname": "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions": { "auth_ref": [ "r251" ], "lang": { "en-us": { "role": { "documentation": "The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.", "label": "Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options", "terseLabel": "Options Outstanding, Number" } } }, "localname": "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit": { "auth_ref": [ "r272" ], "lang": { "en-us": { "role": { "documentation": "The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.", "label": "Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit", "terseLabel": "Range of Exercise Prices, Maximum" } } }, "localname": "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage": { "auth_ref": [ "r243" ], "lang": { "en-us": { "role": { "documentation": "Percentage of vesting of award under share-based payment arrangement.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Percentage", "terseLabel": "Percentage of stock options vested" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod": { "auth_ref": [ "r244" ], "lang": { "en-us": { "role": { "documentation": "Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period", "terseLabel": "Award term" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1": { "auth_ref": [ "r268", "r286" ], "lang": { "en-us": { "role": { "documentation": "Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1", "terseLabel": "Expected life (in years)" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationScheduleOfFairValueOfEachOptionEstimatedOnDateOfGrantUsingWeightedAverageAssumptionsDetails" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1": { "auth_ref": [ "r276" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1", "terseLabel": "Aggregate intrinsic value of exercisable options" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1": { "auth_ref": [ "r276" ], "lang": { "en-us": { "role": { "documentation": "Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1", "terseLabel": "Weighted average remaining contractual term (years), Exercisable" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2": { "auth_ref": [ "r265" ], "lang": { "en-us": { "role": { "documentation": "Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2", "terseLabel": "Weighted average remaining contractual term (years), Outstanding" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Purchase price of common stock expressed as a percentage of its fair value.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Purchase Price Of Common Stock Percent", "terseLabel": "Eligible employees purchase common stock percentage of lower of fair market value" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1": { "auth_ref": [ "r252" ], "lang": { "en-us": { "role": { "documentation": "Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.", "label": "Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1", "terseLabel": "Options Exercisable, Weighted Average Exercise Price" } } }, "localname": "SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1": { "auth_ref": [ "r251" ], "lang": { "en-us": { "role": { "documentation": "The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.", "label": "Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1", "terseLabel": "Options Outstanding, Weighted Average Exercise Price" } } }, "localname": "SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2": { "auth_ref": [ "r265" ], "lang": { "en-us": { "role": { "documentation": "Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2", "terseLabel": "Options Outstanding, Weighted Average Remaining Contractual Life (in years)" } } }, "localname": "SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfInformationAboutStockOptionsOutstandingDetails" ], "xbrltype": "durationItemType" }, "us-gaap_SharesOutstanding": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Number of shares issued which are neither cancelled nor held in the treasury.", "label": "Shares Outstanding", "periodEndLabel": "Ending balance (shares)", "periodStartLabel": "Beginning balance (shares)" } } }, "localname": "SharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "sharesItemType" }, "us-gaap_ShortTermDebtTypeAxis": { "auth_ref": [ "r36" ], "lang": { "en-us": { "role": { "documentation": "Information by type of short-term debt arrangement.", "label": "Short Term Debt Type [Axis]", "terseLabel": "Short-term Debt, Type" } } }, "localname": "ShortTermDebtTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShortTermDebtTypeDomain": { "auth_ref": [ "r35" ], "lang": { "en-us": { "role": { "documentation": "Type of short-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing.", "label": "Short Term Debt Type [Domain]", "terseLabel": "Short-term Debt, Type" } } }, "localname": "ShortTermDebtTypeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SignificantAccountingPoliciesTextBlock": { "auth_ref": [ "r82", "r87" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for all significant accounting policies of the reporting entity.", "label": "Significant Accounting Policies [Text Block]", "terseLabel": "Summary of Significant Accounting Policies" } } }, "localname": "SignificantAccountingPoliciesTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_StateAndLocalJurisdictionMember": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Designated tax department of a state or local government entitled to levy and collect income taxes from the entity.", "label": "State And Local Jurisdiction [Member]", "terseLabel": "State" } } }, "localname": "StateAndLocalJurisdictionMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesScheduleOfFederalAndStateNetOperatingLossesAndResearchTaxCreditsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_StatementClassOfStockAxis": { "auth_ref": [ "r20", "r21", "r22", "r83", "r85", "r105", "r106", "r107", "r109", "r111", "r115", "r116", "r117", "r154", "r181", "r185", "r186", "r187", "r190", "r191", "r199", "r200", "r204", "r208", "r216", "r355", "r476" ], "lang": { "en-us": { "role": { "documentation": "Information by the different classes of stock of the entity.", "label": "Statement Class Of Stock [Axis]", "terseLabel": "Class of Stock" } } }, "localname": "StatementClassOfStockAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICITPARENTHETICAL" ], "xbrltype": "stringItemType" }, "us-gaap_StatementEquityComponentsAxis": { "auth_ref": [ "r2", "r44", "r58", "r59", "r60", "r88", "r89", "r90", "r93", "r100", "r102", "r114", "r161", "r216", "r224", "r282", "r283", "r284", "r314", "r315", "r345", "r366", "r367", "r368", "r369", "r370", "r371", "r435", "r436", "r437", "r485" ], "lang": { "en-us": { "role": { "documentation": "Information by component of equity.", "label": "Statement Equity Components [Axis]", "terseLabel": "Equity Components" } } }, "localname": "StatementEquityComponentsAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "stringItemType" }, "us-gaap_StatementLineItems": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Statement [Line Items]", "terseLabel": "Statement [Line Items]" } } }, "localname": "StatementLineItems", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsTables", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICITPARENTHETICAL" ], "xbrltype": "stringItemType" }, "us-gaap_StatementOfCashFlowsAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Statement Of Cash Flows [Abstract]" } } }, "localname": "StatementOfCashFlowsAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_StatementOfFinancialPositionAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Statement Of Financial Position [Abstract]" } } }, "localname": "StatementOfFinancialPositionAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_StatementOfStockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Statement Of Stockholders Equity [Abstract]" } } }, "localname": "StatementOfStockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "xbrltype": "stringItemType" }, "us-gaap_StatementTable": { "auth_ref": [ "r88", "r89", "r90", "r114", "r402" ], "lang": { "en-us": { "role": { "documentation": "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.", "label": "Statement [Table]", "terseLabel": "Statement [Table]" } } }, "localname": "StatementTable", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsTables", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS", "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETSPARENTHETICAL", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICITPARENTHETICAL" ], "xbrltype": "stringItemType" }, "us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan": { "auth_ref": [ "r21", "r22", "r216", "r224", "r288" ], "lang": { "en-us": { "role": { "documentation": "Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.", "label": "Stock Issued During Period Shares Employee Stock Ownership Plan", "terseLabel": "Issuance of common stock under ESPP, (shares)" } } }, "localname": "StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodSharesNewIssues": { "auth_ref": [ "r21", "r22", "r216", "r224" ], "lang": { "en-us": { "role": { "documentation": "Number of new stock issued during the period.", "label": "Stock Issued During Period Shares New Issues", "terseLabel": "Sale of stock, net of offering costs, (shares)", "verboseLabel": "Sale of common stock in initial public offering" } } }, "localname": "StockIssuedDuringPeriodSharesNewIssues", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation": { "auth_ref": [ "r21", "r22", "r216", "r224" ], "lang": { "en-us": { "role": { "documentation": "Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).", "label": "Stock Issued During Period Shares Share Based Compensation", "terseLabel": "Stock-based compensation expense, including issuance of RSAs (shares)" } } }, "localname": "StockIssuedDuringPeriodSharesShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised": { "auth_ref": [ "r21", "r22", "r216", "r224", "r253" ], "lang": { "en-us": { "role": { "documentation": "Number of share options (or share units) exercised during the current period.", "label": "Stock Issued During Period Shares Stock Options Exercised", "negatedLabel": "Number of shares, Exercised", "terseLabel": "Issuance of common stock upon exercise of stock options, (shares)" } } }, "localname": "StockIssuedDuringPeriodSharesStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityDetails", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan": { "auth_ref": [ "r21", "r22", "r216", "r224" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.", "label": "Stock Issued During Period Value Employee Stock Purchase Plan", "terseLabel": "Issuance of common stock under ESPP" } } }, "localname": "StockIssuedDuringPeriodValueEmployeeStockPurchasePlan", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockIssuedDuringPeriodValueNewIssues": { "auth_ref": [ "r21", "r22", "r216", "r224" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.", "label": "Stock Issued During Period Value New Issues", "terseLabel": "Sale of stock, net of offering costs" } } }, "localname": "StockIssuedDuringPeriodValueNewIssues", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation": { "auth_ref": [ "r21", "r22", "r224", "r240", "r262" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).", "label": "Stock Issued During Period Value Share Based Compensation", "terseLabel": "Stock-based compensation expense, including issuance of RSAs" } } }, "localname": "StockIssuedDuringPeriodValueShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised": { "auth_ref": [ "r44", "r216", "r224" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Value of stock issued as a result of the exercise of stock options.", "label": "Stock Issued During Period Value Stock Options Exercised", "terseLabel": "Issuance of common stock upon exercise of stock options" } } }, "localname": "StockIssuedDuringPeriodValueStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquity": { "auth_ref": [ "r22", "r26", "r27", "r85", "r144", "r154", "r355", "r388" ], "calculation": { "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS": { "order": 10030.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.", "label": "Stockholders Equity", "periodEndLabel": "Ending balance", "periodStartLabel": "Beginning balance", "totalLabel": "Total stockholders\u2019 equity" } } }, "localname": "StockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS", "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Stockholders Equity [Abstract]", "terseLabel": "Stockholders\u2019 equity:" } } }, "localname": "StockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_StockholdersEquityNoteDisclosureTextBlock": { "auth_ref": [ "r84", "r200", "r203", "r204", "r205", "r206", "r207", "r208", "r209", "r210", "r212", "r213", "r215", "r224", "r225" ], "lang": { "en-us": { "role": { "documentation": "The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.", "label": "Stockholders Equity Note Disclosure [Text Block]", "terseLabel": "Convertible Preferred Stock and Common Stock" } } }, "localname": "StockholdersEquityNoteDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStock" ], "xbrltype": "textBlockItemType" }, "us-gaap_SubsequentEventMember": { "auth_ref": [ "r372", "r389" ], "lang": { "en-us": { "role": { "documentation": "Identifies event that occurred after the balance sheet date but before financial statements are issued or available to be issued.", "label": "Subsequent Event [Member]", "terseLabel": "Subsequent Event" } } }, "localname": "SubsequentEventMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SubsequentEventTypeAxis": { "auth_ref": [ "r372", "r389" ], "lang": { "en-us": { "role": { "documentation": "Information by event that occurred after the balance sheet date but before financial statements are issued or available to be issued.", "label": "Subsequent Event Type [Axis]", "terseLabel": "Subsequent Event Type" } } }, "localname": "SubsequentEventTypeAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SubsequentEventTypeDomain": { "auth_ref": [ "r372", "r389" ], "lang": { "en-us": { "role": { "documentation": "Event that occurred after the balance sheet date but before financial statements are issued or available to be issued.", "label": "Subsequent Event Type [Domain]", "terseLabel": "Subsequent Event Type" } } }, "localname": "SubsequentEventTypeDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SubsidiarySaleOfStockAxis": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Information by type of sale of the entity's stock.", "label": "Subsidiary Sale Of Stock [Axis]", "terseLabel": "Sale of Stock" } } }, "localname": "SubsidiarySaleOfStockAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SupplementalCashFlowInformationAbstract": { "auth_ref": [], "lang": { "en-us": { "role": { "label": "Supplemental Cash Flow Information [Abstract]", "terseLabel": "Supplemental disclosures:" } } }, "localname": "SupplementalCashFlowInformationAbstract", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_TaxCreditCarryforwardDescription": { "auth_ref": [ "r308" ], "lang": { "en-us": { "role": { "documentation": "A description of the origin, nature, and characteristics of the tax credit carryforward.", "label": "Tax Credit Carryforward Description", "terseLabel": "NOL and tax credit carryforwards" } } }, "localname": "TaxCreditCarryforwardDescription", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_TemporaryEquityCarryingAmountAttributableToParent": { "auth_ref": [ "r181", "r185", "r186", "r187", "r190", "r191" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.", "label": "Temporary Equity Carrying Amount Attributable To Parent", "periodStartLabel": "Convertible preferred stock, Beginning balance" } } }, "localname": "TemporaryEquityCarryingAmountAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "monetaryItemType" }, "us-gaap_TemporaryEquitySharesIssued": { "auth_ref": [ "r19" ], "lang": { "en-us": { "role": { "documentation": "The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.", "label": "Temporary Equity Shares Issued", "terseLabel": "Convertible preferred stock, shares issued" } } }, "localname": "TemporaryEquitySharesIssued", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureConvertiblePreferredStockAndCommonStockAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_TemporaryEquitySharesOutstanding": { "auth_ref": [ "r19" ], "lang": { "en-us": { "role": { "documentation": "The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.", "label": "Temporary Equity Shares Outstanding", "periodStartLabel": "Convertible preferred stock, Beginning balance (shares)" } } }, "localname": "TemporaryEquitySharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "sharesItemType" }, "us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues": { "auth_ref": [], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Value of new stock classified as temporary equity issued during the period.", "label": "Temporary Equity Stock Issued During Period Value New Issues", "terseLabel": "Sale of convertible preferred stock, net of issuance costs" } } }, "localname": "TemporaryEquityStockIssuedDuringPeriodValueNewIssues", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFCHANGESINCONVERTIBLEPREFERREDSTOCKANDSTOCKHOLDERSEQUITYDEFICIT" ], "xbrltype": "monetaryItemType" }, "us-gaap_TypeOfAdoptionMember": { "auth_ref": [ "r0", "r1", "r2", "r3", "r4", "r92", "r93", "r94", "r95", "r104", "r145", "r146", "r158", "r159", "r160", "r161", "r163", "r164", "r180", "r278", "r279", "r280", "r281", "r282", "r283", "r284", "r285", "r312", "r313", "r314", "r315", "r337", "r338", "r339", "r340", "r341", "r342", "r343", "r344", "r345", "r346", "r347", "r356", "r357", "r359", "r360", "r361", "r362", "r363", "r364", "r385", "r403", "r404", "r405", "r433", "r434", "r435", "r436", "r437", "r438", "r439", "r440", "r441", "r442", "r443", "r444", "r481", "r482", "r483", "r484", "r485" ], "lang": { "en-us": { "role": { "documentation": "Amendment to accounting standards.", "label": "Type Of Adoption [Member]", "terseLabel": "Accounting Standards Update" } } }, "localname": "TypeOfAdoptionMember", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TypeOfArrangementAxis": { "auth_ref": [ "r323" ], "lang": { "en-us": { "role": { "documentation": "Information by collaborative arrangement and arrangement other than collaborative applicable to revenue-generating activity or operations.", "label": "Type Of Arrangement [Axis]", "terseLabel": "Collaborative Arrangement and Arrangement Other than Collaborative" } } }, "localname": "TypeOfArrangementAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureCommitmentsAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued": { "auth_ref": [ "r297" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.", "label": "Unrecognized Tax Benefits Income Tax Penalties Accrued", "terseLabel": "Accrued penalties related to uncertain tax positions" } } }, "localname": "UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense": { "auth_ref": [ "r297" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return.", "label": "Unrecognized Tax Benefits Income Tax Penalties Expense", "terseLabel": "Penalties related to uncertain tax positions" } } }, "localname": "UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued": { "auth_ref": [ "r297" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of interest expense accrued for an underpayment of income taxes.", "label": "Unrecognized Tax Benefits Interest On Income Taxes Accrued", "terseLabel": "Accrued interest related to uncertain tax positions" } } }, "localname": "UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense": { "auth_ref": [ "r297" ], "crdr": "debit", "lang": { "en-us": { "role": { "documentation": "Amount of interest expense for an underpayment of income taxes.", "label": "Unrecognized Tax Benefits Interest On Income Taxes Expense", "terseLabel": "Interest related to uncertain tax positions" } } }, "localname": "UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UseOfEstimates": { "auth_ref": [ "r119", "r120", "r122", "r123", "r124", "r125", "r126" ], "lang": { "en-us": { "role": { "documentation": "Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.", "label": "Use Of Estimates", "terseLabel": "Use of estimates" } } }, "localname": "UseOfEstimates", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount": { "auth_ref": [ "r304" ], "crdr": "credit", "lang": { "en-us": { "role": { "documentation": "Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.", "label": "Valuation Allowance Deferred Tax Asset Change In Amount", "terseLabel": "Deferred tax assets, valuation allowance increase" } } }, "localname": "ValuationAllowanceDeferredTaxAssetChangeInAmount", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_VestingAxis": { "auth_ref": [ "r276" ], "lang": { "en-us": { "role": { "documentation": "Information by vesting schedule of award under share-based payment arrangement.", "label": "Vesting [Axis]", "terseLabel": "Vesting" } } }, "localname": "VestingAxis", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_VestingDomain": { "auth_ref": [ "r276" ], "lang": { "en-us": { "role": { "documentation": "Vesting schedule of award under share-based payment arrangement.", "label": "Vesting [Domain]", "terseLabel": "Vesting" } } }, "localname": "VestingDomain", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted": { "auth_ref": [], "lang": { "en-us": { "role": { "documentation": "Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).", "label": "Weighted Average Number Of Share Outstanding Basic And Diluted", "terseLabel": "Weighted average common shares outstanding, basic and diluted" } } }, "localname": "WeightedAverageNumberOfShareOutstandingBasicAndDiluted", "nsuri": "http://fasb.org/us-gaap/2021-01-31", "presentation": [ "http://preludetx.com/20211231/taxonomy/role/StatementSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSS" ], "xbrltype": "sharesItemType" } }, "unitCount": 9 } }, "std_ref": { "r0": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "105", "URI": "http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695" }, "r1": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "105", "URI": "http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695" }, "r10": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=124098289&loc=d3e6911-107765" }, "r100": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794" }, "r101": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794" }, "r102": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794" }, "r103": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=122038215&loc=d3e31010-122693" }, "r104": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 11.M.Q2)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=122038215&loc=d3e31137-122693" }, "r105": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e1252-109256" }, "r106": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e1278-109256" }, "r107": { "Name": "Accounting Standards Codification", "Paragraph": "55", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e2626-109256" }, "r108": { "Name": "Accounting Standards Codification", "Paragraph": "60B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=SL5780133-109256" }, "r109": { "Name": "Accounting Standards Codification", "Paragraph": "60B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=SL5780133-109256" }, "r11": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=124098289&loc=d3e6935-107765" }, "r110": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=125511455&loc=d3e1337-109256" }, "r111": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257" }, "r112": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257" }, "r113": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257" }, "r114": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "272", "URI": "http://asc.fasb.org/extlink&oid=125520817&loc=d3e70191-108054" }, "r115": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "272", "URI": "http://asc.fasb.org/extlink&oid=125520817&loc=d3e70229-108054" }, "r116": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "272", "URI": "http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055" }, "r117": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "272", "URI": "http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055" }, "r118": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592" }, "r119": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592" }, "r12": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=124098289&loc=d3e7018-107765" }, "r120": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592" }, "r121": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592" }, "r122": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592" }, "r123": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592" }, "r124": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592" }, "r125": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592" }, "r126": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592" }, "r127": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "275", "URI": "http://asc.fasb.org/topic&trid=2134479" }, "r128": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599" }, "r129": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599" }, "r13": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r130": { "Name": "Accounting Standards Codification", "Paragraph": "29", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8864-108599" }, "r131": { "Name": "Accounting Standards Codification", "Paragraph": "29", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8864-108599" }, "r132": { "Name": "Accounting Standards Codification", "Paragraph": "29", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8864-108599" }, "r133": { "Name": "Accounting Standards Codification", "Paragraph": "29", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8864-108599" }, "r134": { "Name": "Accounting Standards Codification", "Paragraph": "29", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8864-108599" }, "r135": { "Name": "Accounting Standards Codification", "Paragraph": "29", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8864-108599" }, "r136": { "Name": "Accounting Standards Codification", "Paragraph": "30", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599" }, "r137": { "Name": "Accounting Standards Codification", "Paragraph": "30", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599" }, "r138": { "Name": "Accounting Standards Codification", "Paragraph": "30", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599" }, "r139": { "Name": "Accounting Standards Codification", "Paragraph": "31", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8924-108599" }, "r14": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(13))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r140": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599" }, "r141": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599" }, "r142": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599" }, "r143": { "Name": "Accounting Standards Codification", "Paragraph": "41", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599" }, "r144": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 4.E)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707" }, "r145": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=124402435&loc=SL124402458-218513" }, "r146": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=124402435&loc=SL124402458-218513" }, "r147": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "20", "Subparagraph": "(d)(1)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=124402435&loc=SL124402458-218513" }, "r148": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562" }, "r149": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=124260329&loc=d3e26626-111562" }, "r15": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(14))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r150": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563" }, "r151": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563" }, "r152": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(3)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563" }, "r153": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "320", "URI": "http://asc.fasb.org/topic&trid=2196928" }, "r154": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "323", "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571" }, "r155": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL120254519-210437" }, "r156": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL120320025-210437" }, "r157": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL120320025-210437" }, "r158": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437" }, "r159": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437" }, "r16": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(17))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r160": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437" }, "r161": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437" }, "r162": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(e)(1)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437" }, "r163": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(e)(3)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437" }, "r164": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(e)(4)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=122640432&loc=SL121648383-210437" }, "r165": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454" }, "r166": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(1)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455" }, "r167": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)(3)", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455" }, "r168": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "55", "SubTopic": "30", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456" }, "r169": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r17": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(26)(a))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r170": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r171": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r172": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r173": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230" }, "r174": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "360", "URI": "http://asc.fasb.org/topic&trid=2155823" }, "r175": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r176": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "440", "URI": "http://asc.fasb.org/topic&trid=2144648" }, "r177": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "450", "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349" }, "r178": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "450", "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14615-108349" }, "r179": { "Name": "Accounting Standards Codification", "Paragraph": "12A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=99376301&loc=SL5988623-112600" }, "r18": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(26)(b))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r180": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S65", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359872&loc=SL124427846-239511" }, "r181": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-01(a)(4)(i))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756" }, "r182": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-01(a)(4)(ii))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756" }, "r183": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-01(a)(4)(iii)(A))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756" }, "r184": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-01(a)(4)(iii))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756" }, "r185": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-01(a)(4)(iv))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756" }, "r186": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-01(a)(5))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756" }, "r187": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-02(a)(4)(i))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756" }, "r188": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-02(a)(4)(iii)(A))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756" }, "r189": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-02(a)(4)(iii)(B))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756" }, "r19": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(27)(b))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r190": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-02(a)(4)(iv))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756" }, "r191": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.13-02(a)(5))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756" }, "r192": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611" }, "r193": { "Name": "Accounting Standards Codification", "Paragraph": "1D", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611" }, "r194": { "Name": "Accounting Standards Codification", "Paragraph": "69B", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612" }, "r195": { "Name": "Accounting Standards Codification", "Paragraph": "69C", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612" }, "r196": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(CFRR 211.02)", "Topic": "480", "URI": "http://asc.fasb.org/extlink&oid=122040564&loc=d3e177068-122764" }, "r197": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643" }, "r198": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21553-112644" }, "r199": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644" }, "r2": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "105", "URI": "http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695" }, "r20": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(27))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r200": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644" }, "r201": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644" }, "r202": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644" }, "r203": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(g)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644" }, "r204": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644" }, "r205": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(i)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644" }, "r206": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644" }, "r207": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644" }, "r208": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644" }, "r209": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644" }, "r21": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(28))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r210": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496180-112644" }, "r211": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496180-112644" }, "r212": { "Name": "Accounting Standards Codification", "Paragraph": "18", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644" }, "r213": { "Name": "Accounting Standards Codification", "Paragraph": "18", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644" }, "r214": { "Name": "Accounting Standards Codification", "Paragraph": "18", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644" }, "r215": { "Name": "Accounting Standards Codification", "Paragraph": "18", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644" }, "r216": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644" }, "r217": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644" }, "r218": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21484-112644" }, "r219": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21488-112644" }, "r22": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(29))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r220": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21506-112644" }, "r221": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21506-112644" }, "r222": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21521-112644" }, "r223": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=123467817&loc=d3e21538-112644" }, "r224": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.3-04)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770" }, "r225": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "505", "URI": "http://asc.fasb.org/topic&trid=2208762" }, "r226": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(i)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920" }, "r227": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(ii)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920" }, "r228": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(iv)(01)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920" }, "r229": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(iv)(02)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920" }, "r23": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30)(a)(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r230": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(iv)(02)(A)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920" }, "r231": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(iv)(02)(B)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920" }, "r232": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(iv)(02)(C)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920" }, "r233": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(iv)(03)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920" }, "r234": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921" }, "r235": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "80", "Subparagraph": "(d)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947" }, "r236": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "80", "Subparagraph": "(f)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947" }, "r237": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "55", "SubTopic": "80", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948" }, "r238": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901" }, "r239": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901" }, "r24": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30)(a)(3))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r240": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901" }, "r241": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901" }, "r242": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r243": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r244": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r245": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(3)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r246": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a),(g)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r247": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b),(f(1))", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r248": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r249": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r25": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30)(a)(4))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r250": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r251": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(i)-(ii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r252": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r253": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iv)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r254": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iv)(3)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r255": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r256": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(i)-(ii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r257": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(iii)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r258": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(iii)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r259": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(iii)(3)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r26": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r260": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(iii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r261": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r262": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r263": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r264": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r265": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r266": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r267": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r268": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r269": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)(ii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r27": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(31))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r270": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)(iii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r271": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)(iv)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r272": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(g)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r273": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r274": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)(1)(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r275": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r276": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901" }, "r277": { "Name": "Accounting Standards Codification", "Paragraph": "2A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901" }, "r278": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333" }, "r279": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333" }, "r28": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(32))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r280": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333" }, "r281": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333" }, "r282": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333" }, "r283": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(f)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333" }, "r284": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(f)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333" }, "r285": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(g)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333" }, "r286": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 14.D.2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809" }, "r287": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 14.F)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809" }, "r288": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "25", "SubTopic": "40", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109244457&loc=d3e16649-113920" }, "r289": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "718", "URI": "http://asc.fasb.org/topic&trid=2228938" }, "r29": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(7))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r290": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "730", "URI": "http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373" }, "r291": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "730", "URI": "http://asc.fasb.org/extlink&oid=6420387&loc=d3e23199-108380" }, "r292": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "730", "URI": "http://asc.fasb.org/extlink&oid=6420387&loc=d3e23221-108380" }, "r293": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=123427490&loc=d3e32247-109318" }, "r294": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=123427490&loc=d3e32280-109318" }, "r295": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319" }, "r296": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319" }, "r297": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319" }, "r298": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319" }, "r299": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319" }, "r3": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "105", "URI": "http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695" }, "r30": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(8))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r300": { "Name": "Accounting Standards Codification", "Paragraph": "19", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32840-109319" }, "r301": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319" }, "r302": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319" }, "r303": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319" }, "r304": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319" }, "r305": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32847-109319" }, "r306": { "Name": "Accounting Standards Codification", "Paragraph": "21", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319" }, "r307": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319" }, "r308": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319" }, "r309": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319" }, "r31": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.1)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r310": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319" }, "r311": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319" }, "r312": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277" }, "r313": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277" }, "r314": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(d)(2)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277" }, "r315": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(d)(3)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277" }, "r316": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(e)(3)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=123459177&loc=SL121830611-158277" }, "r317": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB TOPIC 6.I.5.Q1)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817" }, "r318": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 6.I.Fact.4)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817" }, "r319": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 11.C)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817" }, "r32": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.13(a))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r320": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "270", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338" }, "r321": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331" }, "r322": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "740", "URI": "http://asc.fasb.org/topic&trid=2144680" }, "r323": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "808", "URI": "http://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434" }, "r324": { "Name": "Accounting Standards Codification", "Paragraph": "19", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=123454820&loc=SL4569616-111683" }, "r325": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=123454820&loc=SL4569643-111683" }, "r326": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988" }, "r327": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988" }, "r328": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r329": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r33": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.13)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r330": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(3)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r331": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c),(3)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r332": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bb)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=123419778&loc=d3e5710-111685" }, "r333": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=123419778&loc=d3e5710-111685" }, "r334": { "Name": "Accounting Standards Codification", "Paragraph": "4J", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=120409616&loc=SL4591551-111686" }, "r335": { "Name": "Accounting Standards Codification", "Paragraph": "4K", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=120409616&loc=SL4591552-111686" }, "r336": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "65", "SubTopic": "20", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=121483254&loc=SL120254523-199619" }, "r337": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(a)(1)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r338": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(a)(2)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r339": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(a)(3)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r34": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.14)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r340": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(b)(1)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r341": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(b)(2)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r342": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(c)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r343": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(d)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r344": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(e)(2)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r345": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(e)(3)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r346": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(e)(4)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r347": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(f)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=123482062&loc=SL123482106-238011" }, "r348": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258" }, "r349": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258" }, "r35": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19(a))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r350": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258" }, "r351": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258" }, "r352": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258" }, "r353": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "60", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=7493716&loc=d3e21868-110260" }, "r354": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123594938&loc=d3e13279-108611" }, "r355": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612" }, "r356": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123597120&loc=SL120254526-165497" }, "r357": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123597120&loc=SL120254526-165497" }, "r358": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123597120&loc=SL120254526-165497" }, "r359": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123597120&loc=SL121967933-165497" }, "r36": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r360": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123597120&loc=SL121967933-165497" }, "r361": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123597120&loc=SL121967933-165497" }, "r362": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(c)(2)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123597120&loc=SL121967933-165497" }, "r363": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123597120&loc=SL122642865-165497" }, "r364": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=123597120&loc=SL122642865-165497" }, "r365": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "230", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=123444420&loc=d3e33268-110906" }, "r366": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900" }, "r367": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900" }, "r368": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Subparagraph": "(b)", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900" }, "r369": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Subparagraph": "(c)", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900" }, "r37": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19-26)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r370": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900" }, "r371": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901" }, "r372": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901" }, "r373": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123341672&loc=SL77916155-209984" }, "r374": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123341672&loc=SL120154346-209984" }, "r375": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977" }, "r376": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977" }, "r377": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977" }, "r378": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977" }, "r379": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(3)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980" }, "r38": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.2)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r380": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980" }, "r381": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980" }, "r382": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(2)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980" }, "r383": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980" }, "r384": { "Name": "Accounting Standards Codification", "Paragraph": "53", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971" }, "r385": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "848", "URI": "http://asc.fasb.org/extlink&oid=122150657&loc=SL122150809-237846" }, "r386": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "852", "URI": "http://asc.fasb.org/extlink&oid=124433192&loc=SL2890621-112765" }, "r387": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "852", "URI": "http://asc.fasb.org/extlink&oid=124433192&loc=SL2890621-112765" }, "r388": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "852", "URI": "http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766" }, "r389": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "855", "URI": "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662" }, "r39": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.20)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r390": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "855", "URI": "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314020-165662" }, "r391": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(1)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719" }, "r392": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(2)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719" }, "r393": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(3)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719" }, "r394": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)(1)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719" }, "r395": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)(2)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719" }, "r396": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)(3)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719" }, "r397": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(1)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719" }, "r398": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(2)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719" }, "r399": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(3)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719" }, "r4": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "105", "URI": "http://asc.fasb.org/extlink&oid=124434974&loc=SL124442142-165695" }, "r40": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.21)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r400": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "910", "URI": "http://asc.fasb.org/extlink&oid=123353855&loc=SL119991595-234733" }, "r401": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "25", "SubTopic": "730", "Topic": "912", "URI": "http://asc.fasb.org/extlink&oid=6472174&loc=d3e58812-109433" }, "r402": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 11.L)", "Topic": "924", "URI": "http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856" }, "r403": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "926", "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079" }, "r404": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "926", "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079" }, "r405": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "926", "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079" }, "r406": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "320", "Topic": "940", "URI": "http://asc.fasb.org/subtopic&trid=2176304" }, "r407": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(1)(a))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r408": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(10))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r409": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(11))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r41": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.24)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r410": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(15)(2))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r411": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(23))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r412": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.17)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878" }, "r413": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(22))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260" }, "r414": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(26))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260" }, "r415": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "235", "Subparagraph": "(SX 210.9-05(b)(2))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884" }, "r416": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "320", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123599081&loc=d3e62652-112803" }, "r417": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "320", "Topic": "942", "URI": "http://asc.fasb.org/subtopic&trid=2209399" }, "r418": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "360", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=124429447&loc=SL124453093-239630" }, "r419": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "825", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=123345438&loc=d3e61044-112788" }, "r42": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.25)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r420": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(15)(b)(2))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r421": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(10))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r422": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(12))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r423": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(2))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r424": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(23)(a)(3))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r425": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(23)(a)(4))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r426": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(25))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r427": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(8))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r428": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03.(a),19)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910" }, "r429": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(18))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263" }, "r43": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.28,29)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r430": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(22))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263" }, "r431": { "Name": "Accounting Standards Codification", "Paragraph": "7A", "Publisher": "FASB", "Section": "50", "SubTopic": "40", "Subparagraph": "(d)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124506351&loc=SL117782755-158439" }, "r432": { "Name": "Accounting Standards Codification", "Paragraph": "29F", "Publisher": "FASB", "Section": "55", "SubTopic": "40", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124504033&loc=SL117819544-158441" }, "r433": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(a)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r434": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(b)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r435": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(e)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r436": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(f)(1)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r437": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(f)(2)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r438": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(g)(1)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r439": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(g)(2)(i)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r44": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.29-31)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r440": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(g)(2)(ii)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r441": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(g)(2)(iii)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r442": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(g)(2)(iv)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r443": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(h)(1)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r444": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "40", "Subparagraph": "(h)(2)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641" }, "r445": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "80", "Subparagraph": "(e)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=124508989&loc=d3e19393-158473" }, "r446": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 1))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010" }, "r447": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 6))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010" }, "r448": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 7))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010" }, "r449": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 1))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010" }, "r45": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.8,17)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r450": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 6))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010" }, "r451": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 7))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010" }, "r452": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 1))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010" }, "r453": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 6))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010" }, "r454": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 7))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010" }, "r455": { "Name": "Accounting Standards Codification", "Paragraph": "5D", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-13D(Column B)(Footnote 2))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010" }, "r456": { "Name": "Accounting Standards Codification", "Paragraph": "5D", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-13D(Column C)(Footnote 2))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010" }, "r457": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-15(Column A))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010" }, "r458": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-15(Column B))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010" }, "r459": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-15(Column C))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010" }, "r46": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.9)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r460": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-15(Column D))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010" }, "r461": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "320", "Topic": "946", "URI": "http://asc.fasb.org/subtopic&trid=2324412" }, "r462": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "360", "Subparagraph": "(d)", "Topic": "958", "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916" }, "r463": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "360", "Topic": "958", "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916" }, "r464": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "360", "Topic": "958", "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916" }, "r465": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "310", "Subparagraph": "(c)", "Topic": "976", "URI": "http://asc.fasb.org/extlink&oid=6497875&loc=d3e22274-108663" }, "r466": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "310", "Subparagraph": "(b)", "Topic": "978", "URI": "http://asc.fasb.org/extlink&oid=123360121&loc=d3e27327-108691" }, "r467": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "985", "URI": "http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756" }, "r468": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b" }, "r469": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b-2" }, "r47": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX210.5-02(13))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682" }, "r470": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b-23" }, "r471": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "d1-1" }, "r472": { "Name": "Form 10-K", "Number": "249", "Publisher": "SEC", "Section": "310" }, "r473": { "Name": "Form 20-F", "Number": "249", "Publisher": "SEC", "Section": "220", "Subsection": "f" }, "r474": { "Name": "Form 40-F", "Number": "249", "Publisher": "SEC", "Section": "240", "Subsection": "f" }, "r475": { "Name": "Forms 10-K, 10-Q, 20-F", "Number": "240", "Publisher": "SEC", "Section": "13", "Subsection": "a-1" }, "r476": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(a)", "Publisher": "SEC", "Section": "1402" }, "r477": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(b)", "Publisher": "SEC", "Section": "1403" }, "r478": { "Name": "Regulation S-T", "Number": "232", "Publisher": "SEC", "Section": "405" }, "r479": { "Name": "Securities Act", "Number": "230", "Publisher": "SEC", "Section": "405" }, "r48": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580" }, "r480": { "Name": "Securities Act", "Number": "7A", "Publisher": "SEC", "Section": "B", "Subsection": "2" }, "r481": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "848" }, "r482": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "848" }, "r483": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)(2)", "Topic": "848" }, "r484": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)(3)(iii)(01)", "Topic": "848" }, "r485": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(a)(3)(iii)(03)", "Topic": "848" }, "r49": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580" }, "r5": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760" }, "r50": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580" }, "r51": { "Name": "Accounting Standards Codification", "Paragraph": "14A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580" }, "r52": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669619-108580" }, "r53": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669619-108580" }, "r54": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669625-108580" }, "r55": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=SL7669625-108580" }, "r56": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124509347&loc=d3e557-108580" }, "r57": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124431353&loc=SL116659661-227067" }, "r58": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067" }, "r59": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067" }, "r6": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765" }, "r60": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=124431353&loc=SL124452729-227067" }, "r61": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(20))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227" }, "r62": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(24))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227" }, "r63": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(4))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227" }, "r64": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.4)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227" }, "r65": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.9)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227" }, "r66": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585" }, "r67": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585" }, "r68": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585" }, "r69": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585" }, "r7": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765" }, "r70": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3000-108585" }, "r71": { "Name": "Accounting Standards Codification", "Paragraph": "24", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585" }, "r72": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585" }, "r73": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585" }, "r74": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585" }, "r75": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585" }, "r76": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585" }, "r77": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=d3e4273-108586" }, "r78": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586" }, "r79": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586" }, "r8": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765" }, "r80": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586" }, "r81": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586" }, "r82": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=123372394&loc=d3e18726-107790" }, "r83": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(d))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690" }, "r84": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(e)(1))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690" }, "r85": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(g)(1)(ii))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690" }, "r86": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(h)(2))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690" }, "r87": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "235", "URI": "http://asc.fasb.org/topic&trid=2122369" }, "r88": { "Name": "Accounting Standards Codification", "Paragraph": "23", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124436220&loc=d3e21914-107793" }, "r89": { "Name": "Accounting Standards Codification", "Paragraph": "24", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124436220&loc=d3e21930-107793" }, "r9": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=124098289&loc=d3e6801-107765" }, "r90": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124436220&loc=d3e21711-107793" }, "r91": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794" }, "r92": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(2)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794" }, "r93": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(3)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794" }, "r94": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(4)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794" }, "r95": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794" }, "r96": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794" }, "r97": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794" }, "r98": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794" }, "r99": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794" } }, "version": "2.1" }