{ "instance": { "a2018q3bhvn10-q.htm": { "axisCustom": 2, "axisStandard": 21, "contextCount": 146, "dts": { "calculationLink": { "local": [ "bhvn-20180930_cal.xml" ] }, "definitionLink": { "local": [ "bhvn-20180930_def.xml" ], "remote": [ "http://xbrl.fasb.org/srt/2018/elts/srt-eedm1-def-2018-01-31.xml", "http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-eedm-def-2018-01-31.xml" ] }, "inline": { "local": [ "a2018q3bhvn10-q.htm" ] }, "labelLink": { "local": [ "bhvn-20180930_lab.xml" ], "remote": [ "http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-doc-2018-01-31.xml", "https://xbrl.sec.gov/dei/2018/dei-doc-2018-01-31.xml" ] }, "presentationLink": { "local": [ "bhvn-20180930_pre.xml" ] }, "referenceLink": { "remote": [ "http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-ref-2018-01-31.xml", "https://xbrl.sec.gov/dei/2018/dei-ref-2018-01-31.xml" ] }, "schema": { "local": [ "bhvn-20180930.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/dtr/type/nonNumeric-2009-12-16.xsd", "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd", "http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/deprecated-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", "http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd", "http://xbrl.fasb.org/srt/2018/elts/srt-roles-2018-01-31.xsd", "http://xbrl.fasb.org/srt/2018/elts/srt-types-2018-01-31.xsd", "http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd", "http://xbrl.fasb.org/us-gaap/2018/elts/us-parts-codification-2018-01-31.xsd", "http://xbrl.fasb.org/us-gaap/2018/elts/us-roles-2018-01-31.xsd", "http://xbrl.fasb.org/us-gaap/2018/elts/us-types-2018-01-31.xsd", "http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd", "http://xbrl.sec.gov/currency/2017/currency-2017-01-31.xsd", "http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd", "http://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd", "http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd", "https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd", "https://xbrl.sec.gov/exch/2018/exch-2018-01-31.xsd", "https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd" ] } }, "elementCount": 375, "entityCount": 1, "hidden": { "http://biohavenpharma.com/20180930": 3, "http://fasb.org/us-gaap/2018-01-31": 15, "http://xbrl.sec.gov/dei/2018-01-31": 13, "total": 31 }, "keyCustom": 64, "keyStandard": 152, "memberCustom": 21, "memberStandard": 23, "nsprefix": "bhvn", "nsuri": "http://biohavenpharma.com/20180930", "report": { "R1": { "firstAnchor": { "ancestors": [ "span", "span", "div", "body", "html" ], "contextRef": "I2018Q4Nov12", "decimals": "INF", "first": true, "lang": null, "name": "dei:EntityCommonStockSharesOutstanding", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" }, "groupType": "document", "isDefault": "true", "longName": "0001000 - Document - Document and Entity Information", "role": "http://biohavenpharma.com/role/DocumentAndEntityInformation", "shortName": "Document and Entity Information", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "body", "html" ], "contextRef": "I2018Q4Nov12", "decimals": "INF", "first": true, "lang": null, "name": "dei:EntityCommonStockSharesOutstanding", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" } }, "R10": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EquityMethodInvestmentsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2105100 - Disclosure - Equity Method Investment", "role": "http://biohavenpharma.com/role/EquityMethodInvestment", "shortName": "Equity Method Investment", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EquityMethodInvestmentsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R11": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2106100 - Disclosure - Accrued Expenses", "role": "http://biohavenpharma.com/role/AccruedExpenses", "shortName": "Accrued Expenses", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R12": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DebtDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2107100 - Disclosure - Liability Related to Sale of Future Royalties", "role": "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyalties", "shortName": "Liability Related to Sale of Future Royalties", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DebtDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R13": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:WarrantsAndCreditAgreementsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2108100 - Disclosure - Warrants", "role": "http://biohavenpharma.com/role/Warrants", "shortName": "Warrants", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:WarrantsAndCreditAgreementsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R14": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:TemporaryEquityDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2109100 - Disclosure - Convertible Preferred Shares", "role": "http://biohavenpharma.com/role/ConvertiblePreferredShares", "shortName": "Convertible Preferred Shares", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:TemporaryEquityDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R15": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2110100 - Disclosure - Shareholders' Equity", "role": "http://biohavenpharma.com/role/ShareholdersEquity", "shortName": "Shareholders' Equity", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R16": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EarningsPerShareTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2111100 - Disclosure - Net Loss per Share", "role": "http://biohavenpharma.com/role/NetLossPerShare", "shortName": "Net Loss per Share", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EarningsPerShareTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R17": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CollaborativeArrangementDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2112100 - Disclosure - License and Other Agreements", "role": "http://biohavenpharma.com/role/LicenseAndOtherAgreements", "shortName": "License and Other Agreements", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CollaborativeArrangementDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R18": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2113100 - Disclosure - Commitments and Contingencies", "role": "http://biohavenpharma.com/role/CommitmentsAndContingencies", "shortName": "Commitments and Contingencies", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R19": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RelatedPartyTransactionsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2114100 - Disclosure - Related Party Transactions", "role": "http://biohavenpharma.com/role/RelatedPartyTransactions", "shortName": "Related Party Transactions", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RelatedPartyTransactionsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R2": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "1001000 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS", "role": "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets", "shortName": "CONDENSED CONSOLIDATED BALANCE SHEETS", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "lang": null, "name": "us-gaap:AssetsCurrent", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R20": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:UseOfEstimates", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2202201 - Disclosure - Summary of Significant Accounting Policies (Policies)", "role": "http://biohavenpharma.com/role/SummaryOfSignificantAccountingPoliciesPolicies", "shortName": "Summary of Significant Accounting Policies (Policies)", "subGroupType": "policies", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:UseOfEstimates", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R21": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2303301 - Disclosure - Fair Value of Financial Assets and Liabilities (Tables)", "role": "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesTables", "shortName": "Fair Value of Financial Assets and Liabilities (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R22": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2304301 - Disclosure - Prepaid Expenses and Other Current Assets (Tables)", "role": "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsTables", "shortName": "Prepaid Expenses and Other Current Assets (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R23": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:ScheduleOfProportionateShareOfEquityInvestmentIncomeOrLossTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2305301 - Disclosure - Equity Method Investment (Tables)", "role": "http://biohavenpharma.com/role/EquityMethodInvestmentTables", "shortName": "Equity Method Investment (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:ScheduleOfProportionateShareOfEquityInvestmentIncomeOrLossTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R24": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2306301 - Disclosure - Accrued Expenses (Tables)", "role": "http://biohavenpharma.com/role/AccruedExpensesTables", "shortName": "Accrued Expenses (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAccruedLiabilitiesTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R25": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfDebtTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2307301 - Disclosure - Liability Related to Sale of Future Royalties (Tables)", "role": "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesTables", "shortName": "Liability Related to Sale of Future Royalties (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfDebtTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R26": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:ScheduleOfWarrantyLiabilityIncomeAndExpenseTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2308301 - Disclosure - Warrants (Tables)", "role": "http://biohavenpharma.com/role/WarrantsTables", "shortName": "Warrants (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:ScheduleOfWarrantyLiabilityIncomeAndExpenseTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R27": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfStockholdersEquityTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2310301 - Disclosure - Shareholders' Equity (Tables)", "role": "http://biohavenpharma.com/role/ShareholdersEquityTables", "shortName": "Shareholders' Equity (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfStockholdersEquityTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R28": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2311301 - Disclosure - Net Loss per Share (Tables)", "role": "http://biohavenpharma.com/role/NetLossPerShareTables", "shortName": "Net Loss per Share (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R29": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfRentExpenseTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2313301 - Disclosure - Commitments and Contingencies (Tables)", "role": "http://biohavenpharma.com/role/CommitmentsAndContingenciesTables", "shortName": "Commitments and Contingencies (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfRentExpenseTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R3": { "firstAnchor": null, "groupType": "statement", "isDefault": "false", "longName": "1001501 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)", "role": "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheetsParenthetical", "shortName": "CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": null }, "R30": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FI2018Q2", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:SharePrice", "reportCount": 1, "unitRef": "usdPerShare", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2401401 - Disclosure - Nature of the Business and Basis of Presentation - Initial Public Offering (Details)", "role": "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails", "shortName": "Nature of the Business and Basis of Presentation - Initial Public Offering (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2017Q2May1toMay31", "decimals": "-3", "lang": null, "name": "bhvn:ProceedsFromIssuanceOfInitialPublicOfferingAndUnderwritersIssuance", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R31": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2401402 - Disclosure - Nature of the Business and Basis of Presentation - Going Concern (Details)", "role": "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails", "shortName": "Nature of the Business and Basis of Presentation - Going Concern (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R32": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "contextRef": "FI2017Q4_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMember", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FinancialLiabilitiesFairValueDisclosure", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2403402 - Disclosure - Fair Value of Financial Assets and Liabilities - Measured on a Recurring Basis (Details)", "role": "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails", "shortName": "Fair Value of Financial Assets and Liabilities - Measured on a Recurring Basis (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "contextRef": "FI2017Q4_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMember", "decimals": "-3", "lang": null, "name": "us-gaap:FinancialLiabilitiesFairValueDisclosure", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R33": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q3Aug30toAug30", "decimals": "INF", "first": true, "lang": null, "name": "bhvn:NumberOfDirectorsToWhomEntityAgreedToIssueWarrants", "reportCount": 1, "unitRef": "director", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2403403 - Disclosure - Fair Value of Financial Assets and Liabilities - Narrative (Details)", "role": "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "shortName": "Fair Value of Financial Assets and Liabilities - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2017Q2May1toMay31_srt_CounterpartyNameAxis_bhvn_BristolMyersSquibbCompanyMember", "decimals": "INF", "lang": null, "name": "us-gaap:StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" } }, "R34": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q1Jan26", "decimals": "-3", "first": true, "lang": null, "name": "bhvn:AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrantLiabilityToEquity", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2403404 - Disclosure - Fair Value of Financial Assets and Liabilities - Rollforward of Liabilities Measured by Level 3 Inputs (Details)", "role": "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails", "shortName": "Fair Value of Financial Assets and Liabilities - Rollforward of Liabilities Measured by Level 3 Inputs (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD_us-gaap_FairValueByLiabilityClassAxis_us-gaap_WarrantMember", "decimals": "-3", "lang": null, "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R35": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OtherPrepaidExpenseCurrent", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2404402 - Disclosure - Prepaid Expenses and Other Current Assets (Details)", "role": "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails", "shortName": "Prepaid Expenses and Other Current Assets (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OtherPrepaidExpenseCurrent", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R36": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:PaymentsToAcquireEquityMethodInvestments", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2405402 - Disclosure - Equity Method Investment - Stock Purchase Agreement with Kleo (Details)", "role": "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "shortName": "Equity Method Investment - Stock Purchase Agreement with Kleo (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "I2016Q3Aug29_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_bhvn_KleoPharmaceuticalsIncMember", "decimals": "INF", "lang": null, "name": "bhvn:EquityMethodSharesOfCommonStockToBePurchasedPerAgreement", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" } }, "R37": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FD2018Q3QTD", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:IncomeLossFromEquityMethodInvestments", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2405403 - Disclosure - Equity Method Investment - Proportionate Share of Net Loss (Details)", "role": "http://biohavenpharma.com/role/EquityMethodInvestmentProportionateShareOfNetLossDetails", "shortName": "Equity Method Investment - Proportionate Share of Net Loss (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R38": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:EquityMethodInvestments", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2405404 - Disclosure - Equity Method Investment - Carrying Value (Details)", "role": "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails", "shortName": "Equity Method Investment - Carrying Value (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R39": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:EmployeeRelatedLiabilitiesCurrent", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2406402 - Disclosure - Accrued Expenses (Details)", "role": "http://biohavenpharma.com/role/AccruedExpensesDetails", "shortName": "Accrued Expenses (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:EmployeeRelatedLiabilitiesCurrent", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R4": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FD2018Q3QTD", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ResearchAndDevelopmentExpense", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "1002000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS", "role": "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss", "shortName": "CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FD2018Q3QTD", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ResearchAndDevelopmentExpense", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R40": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q1Jun01-30", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProceedsFromIssuanceOfCommonStock", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2407402 - Disclosure - Liability Related to Sale of Future Royalties - Narrative (Details)", "role": "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "shortName": "Liability Related to Sale of Future Royalties - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FI2018Q2_us-gaap_DebtInstrumentAxis_bhvn_RPIAgreementMember", "decimals": "-3", "lang": null, "name": "bhvn:LiabilityForSaleOfFutureRoyaltiesInitialAmountGross", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R41": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FD2018Q3QTD", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:InterestExpenseOther", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2407403 - Disclosure - Liability Related to Sale of Future Royalties - Carrying Value and Related Activity (Details)", "role": "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesCarryingValueAndRelatedActivityDetails", "shortName": "Liability Related to Sale of Future Royalties - Carrying Value and Related Activity (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FD2018Q3QTD", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:InterestExpenseOther", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R42": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q3Aug30toAug30", "decimals": "INF", "first": true, "lang": null, "name": "bhvn:NumberOfDirectorsToWhomEntityAgreedToIssueWarrants", "reportCount": 1, "unitRef": "director", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2408402 - Disclosure - Warrants - Credit Agreement (Details)", "role": "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails", "shortName": "Warrants - Credit Agreement (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2017Q3QTD", "decimals": "-3", "lang": null, "name": "us-gaap:InterestExpenseDebt", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R43": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q3Aug30toAug30", "decimals": "INF", "first": true, "lang": null, "name": "bhvn:NumberOfDirectorsToWhomEntityAgreedToIssueWarrants", "reportCount": 1, "unitRef": "director", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2408403 - Disclosure - Warrants - Guarantor and Co-Guarantor Warrants (Details)", "role": "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails", "shortName": "Warrants - Guarantor and Co-Guarantor Warrants (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R44": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FD2018Q3QTD", "decimals": "-3", "first": true, "lang": null, "name": "bhvn:AccretionOfBeneficialConversionFeatureValueConvertibleInstruments", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2409401 - Disclosure - Convertible Preferred Shares (Details)", "role": "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "shortName": "Convertible Preferred Shares (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2017Q1Feb1toFeb28_us-gaap_StatementClassOfStockAxis_us-gaap_ConvertiblePreferredStockMember", "decimals": "-3", "lang": null, "name": "bhvn:AccretionOfBeneficialConversionFeatureValueConvertibleInstruments", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R45": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "contextRef": "FI2018Q2", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2410402 - Disclosure - Shareholders' Equity - Changes in Shareholders' Equity (Details)", "role": "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails", "shortName": "Shareholders' Equity - Changes in Shareholders' Equity (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q1QTD", "decimals": "-3", "lang": null, "name": "bhvn:StockIssuedDuringPeriodValueEquityMethodInvestments", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R46": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FI2018Q2", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:SharePrice", "reportCount": 1, "unitRef": "usdPerShare", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2410403 - Disclosure - Shareholders' Equity - Narrative (Details)", "role": "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails", "shortName": "Shareholders' Equity - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q1Mar01-31_us-gaap_SubsidiarySaleOfStockAxis_us-gaap_PrivatePlacementMember", "decimals": "INF", "lang": null, "name": "us-gaap:StockIssuedDuringPeriodSharesNewIssues", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" } }, "R47": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FD2018Q3QTD", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2411402 - Disclosure - Net Loss per Share - Calculation of Basic and Diluted Net Loss per Share (Details)", "role": "http://biohavenpharma.com/role/NetLossPerShareCalculationOfBasicAndDilutedNetLossPerShareDetails", "shortName": "Net Loss per Share - Calculation of Basic and Diluted Net Loss per Share (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R48": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2411403 - Disclosure - Net Loss per Share - Antidilutive Securities Excluded from Computation of Net Loss per Share (Details)", "role": "http://biohavenpharma.com/role/NetLossPerShareAntidilutiveSecuritiesExcludedFromComputationOfNetLossPerShareDetails", "shortName": "Net Loss per Share - Antidilutive Securities Excluded from Computation of Net Loss per Share (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" } }, "R49": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q1Jan1toJan31_srt_CounterpartyNameAxis_bhvn_CatalentAgreementMember_us-gaap_TypeOfArrangementAxis_us-gaap_CollaborativeArrangementMember", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:PeriodOfTimeForPatentExpiration", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2412401 - Disclosure - License and Other Agreements (Details)", "role": "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails", "shortName": "License and Other Agreements (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q1Jan1toJan31_srt_CounterpartyNameAxis_bhvn_CatalentAgreementMember_us-gaap_TypeOfArrangementAxis_us-gaap_CollaborativeArrangementMember", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:PeriodOfTimeForPatentExpiration", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R5": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "1003000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS", "role": "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "shortName": "CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": "-3", "lang": null, "name": "us-gaap:ShareBasedCompensation", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R50": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q1Jun01-30_us-gaap_DebtInstrumentAxis_bhvn_RPIFundingAgreementMember", "decimals": "-3", "first": true, "lang": null, "name": "bhvn:ProceedsFromRoyaltyAgreement", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2412402 - Disclosure - License and Other Agreements - Revenue Participation Rights with RPI Finance Trust (Details)", "role": "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails", "shortName": "License and Other Agreements - Revenue Participation Rights with RPI Finance Trust (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R51": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "contextRef": "FD2018Q3QTD", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:StockIssuedDuringPeriodValuePurchaseOfAssets", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2412403 - Disclosure - License and Other Agreements - License Agreement with AstraZeneca (Details)", "role": "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "shortName": "License and Other Agreements - License Agreement with AstraZeneca (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2018Q3Sep01-30_srt_CounterpartyNameAxis_bhvn_AstraZenecaMember_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_us-gaap_LicensingAgreementsMember", "decimals": "-3", "lang": null, "name": "bhvn:MilestonePaymentToBePaidByCompanyUponSpecifiedRegulatoryAndCommercialMilestoneAchievement", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R52": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "first": true, "lang": null, "name": "bhvn:AccruedClinicalTrialCostsCurrent", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2413402 - Disclosure - Commitments and Contingencies - Lease Agreements and License Agreements (Details)", "role": "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails", "shortName": "Commitments and Contingencies - Lease Agreements and License Agreements (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "I2018Q4Oct31_srt_CounterpartyNameAxis_bhvn_BMSAgreementMember_us-gaap_SubsequentEventTypeAxis_us-gaap_SubsequentEventMember", "decimals": "-3", "lang": null, "name": "bhvn:AccruedClinicalTrialCostsCurrent", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R53": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "contextRef": "FI2018Q3", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CommonStockValue", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2414401 - Disclosure - Related Party Transactions (Details)", "role": "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails", "shortName": "Related Party Transactions (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "contextRef": "D2013Q3Sep30toSep30_us-gaap_RelatedPartyTransactionAxis_bhvn_YaleLicenseAgreementTermsMember_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_us-gaap_ExecutiveOfficerMember", "decimals": "INF", "lang": null, "name": "bhvn:NumberOfInventorsOfLicensedPatents", "reportCount": 1, "unique": true, "unitRef": "investor", "xsiNil": "false" } }, "R6": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2101100 - Disclosure - Nature of the Business and Basis of Presentation", "role": "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentation", "shortName": "Nature of the Business and Basis of Presentation", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R7": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2102100 - Disclosure - Summary of Significant Accounting Policies", "role": "http://biohavenpharma.com/role/SummaryOfSignificantAccountingPolicies", "shortName": "Summary of Significant Accounting Policies", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R8": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2103100 - Disclosure - Fair Value of Financial Assets and Liabilities", "role": "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilities", "shortName": "Fair Value of Financial Assets and Liabilities", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R9": { "firstAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:PrepaidExpenseAndOtherAssetsCurrentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2104100 - Disclosure - Prepaid Expenses and Other Current Assets", "role": "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssets", "shortName": "Prepaid Expenses and Other Current Assets", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "div", "body", "html" ], "contextRef": "FD2018Q3YTD", "decimals": null, "first": true, "lang": "en-US", "name": "bhvn:PrepaidExpenseAndOtherAssetsCurrentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } } }, "segmentCount": 48, "tag": { "bhvn_AccretionOfBeneficialConversionFeatureValueConvertibleInstruments": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 1.0, "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Represents the information pertains to accretion of value due to beneficial conversion feature", "label": "Accretion Of Beneficial Conversion Feature Value Convertible Instruments", "negatedLabel": "Accretion of beneficial conversion feature on Series A preferred shares", "negatedTerseLabel": "Accretion of beneficial conversion feature on Series A convertible preferred shares", "terseLabel": "Accretion of beneficial conversion feature on Series A preferred shares" } } }, "localname": "AccretionOfBeneficialConversionFeatureValueConvertibleInstruments", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss", "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "http://biohavenpharma.com/role/NetLossPerShareCalculationOfBasicAndDilutedNetLossPerShareDetails", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_AccruedClinicalTrialCostsCurrent": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/AccruedExpensesDetails": { "order": 1.0, "parentTag": "us-gaap_AccruedLiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of expenses incurred but not yet paid classified as clinical trial costs, due within one year or the normal operating cycle, if longer.", "label": "Accrued Clinical Trial Costs, Current", "terseLabel": "Accrued clinical trial costs" } } }, "localname": "AccruedClinicalTrialCostsCurrent", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/AccruedExpensesDetails", "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrantLiabilityToEquity": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in additional paid in capital (APIC) resulting from reclassification of warrant liability to equity", "label": "Adjustments to Additional Paid in Capital, Reclassification Of Warrant Liability To Equity", "negatedLabel": "Reclassification to equity", "terseLabel": "Reclassification of warrant liability to equity", "verboseLabel": "Reclassification of fair value of warrant liability to shareholders' equity" } } }, "localname": "AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrantLiabilityToEquity", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails", "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_AlsBiopharmaMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the information pertaining to the entity's agreement with ALS Biopharma.", "label": "Als Biopharma [Member]", "terseLabel": "ALS Biopharma" } } }, "localname": "AlsBiopharmaMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "domainItemType" }, "bhvn_AmortizationOfLicenseAgreements": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 5.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amortization Of License Agreements", "label": "Amortization Of License Agreements", "terseLabel": "Non-cash expense related to license agreement" } } }, "localname": "AmortizationOfLicenseAgreements", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "bhvn_AstraZenecaMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information pertaining to Astra Zeneca", "label": "Astra Zeneca [Member]", "terseLabel": "AstraZeneca" } } }, "localname": "AstraZenecaMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "domainItemType" }, "bhvn_AutomaticExtensionOfLicenseAgreementPeriod": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the automatic extension of the license agreement unless either party gives notice of intent to terminate.", "label": "Automatic Extension of License Agreement Period", "terseLabel": "Automatic extension period" } } }, "localname": "AutomaticExtensionOfLicenseAgreementPeriod", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "durationItemType" }, "bhvn_BMSAgreementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the entity's license agreement with BMS (the \"BMS Agreement\")for the development and commercialization rights as well as other CGRP-related intellectual property.", "label": "B M S Agreement [Member]", "terseLabel": "BMS Agreement" } } }, "localname": "BMSAgreementMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "domainItemType" }, "bhvn_BeneficialConversionFeatureValueConvertibleInstruments": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Represents the information pertains to value of beneficial conversion feature", "label": "Beneficial Conversion Feature Value Convertible Instruments", "negatedLabel": "Beneficial conversion feature on Series A preferred shares", "negatedTerseLabel": "Beneficial conversion feature on Series A preferred shares", "verboseLabel": "Recognized fair value of BCF as a reduction to series A preferred shares and corresponding adjustment to additional paid in capital" } } }, "localname": "BeneficialConversionFeatureValueConvertibleInstruments", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_BristolMyersSquibbCompanyMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Bristol-Myers Squibb Company [Member]", "label": "Bristol-Myers Squibb Company [Member]", "terseLabel": "BMS" } } }, "localname": "BristolMyersSquibbCompanyMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "bhvn_CarryingValueOfContingentConsiderationClassifiedAsLongTermLiability": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying value of contingent consideration classified as long-term liability.", "label": "Carrying Value Of Contingent Consideration Classified As Long Term Liability", "terseLabel": "Value of the contingently issuable equity" } } }, "localname": "CarryingValueOfContingentConsiderationClassifiedAsLongTermLiability", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_CatalentAgreementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the entity's agreement with Catalent.", "label": "Catalent Agreement [Member]", "terseLabel": "Catalent Agreement" } } }, "localname": "CatalentAgreementMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "domainItemType" }, "bhvn_CommercialSupplyAgreementInitialTerm": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Commercial Supply Agreement, Initial Term", "label": "Commercial Supply Agreement, Initial Term", "terseLabel": "Initial term of commercial supply agreement" } } }, "localname": "CommercialSupplyAgreementInitialTerm", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "durationItemType" }, "bhvn_CommercialSupplyAgreementRenewalPeriod": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Commercial Supply Agreement, Renewal Period", "label": "Commercial Supply Agreement, Renewal Period", "terseLabel": "Renewal Period of commercial supply agreement" } } }, "localname": "CommercialSupplyAgreementRenewalPeriod", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "durationItemType" }, "bhvn_ConstructionCostsCapitalized": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of construction costs capitalized during the period.", "label": "Construction Costs Capitalized", "terseLabel": "Capitalized construction costs" } } }, "localname": "ConstructionCostsCapitalized", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_ContingentConsiderationClassifiedAsLongTermLiabilityFairValueDisclosure": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Fair value of contingent consideration from license agreement that is classified in long-term liability.", "label": "Contingent Consideration Classified as Long Term Liability, Fair Value Disclosure", "terseLabel": "Fair value of the contingent equity liability" } } }, "localname": "ContingentConsiderationClassifiedAsLongTermLiabilityFairValueDisclosure", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_ContingentConsiderationClassifiedAsLongTermLiabilityMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Contingent consideration classified as long-term liability", "label": "Contingent Consideration Classified As Long Term Liability [Member]", "terseLabel": "Contingent Equity Liability" } } }, "localname": "ContingentConsiderationClassifiedAsLongTermLiabilityMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails" ], "xbrltype": "domainItemType" }, "bhvn_ContingentEquityLiabilityMeasurementInput": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Contingent Equity Liability, Measurement Input", "label": "Contingent Equity Liability, Measurement Input", "terseLabel": "Measurement input for contingent equity liability" } } }, "localname": "ContingentEquityLiabilityMeasurementInput", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "decimalItemType" }, "bhvn_ContingentlyIssuableEquityAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by tranches of contingently issuable equity.", "label": "Contingently Issuable Equity [Axis]", "terseLabel": "Contingently Issuable Equity [Axis]" } } }, "localname": "ContingentlyIssuableEquityAxis", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "stringItemType" }, "bhvn_ContingentlyIssuableEquityDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tranches schedule by contingently issuable equity.", "label": "Contingently Issuable Equity [Domain]", "terseLabel": "Contingently Issuable Equity [Domain]" } } }, "localname": "ContingentlyIssuableEquityDomain", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "bhvn_ContractPriceRevenueParticipationRightsAvailableForRepurchase": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Contract Price, Revenue Participation Rights Available For Repurchase", "label": "Contract Price, Revenue Participation Rights Available For Repurchase", "terseLabel": "Price of revenue participation rights available for repurchase" } } }, "localname": "ContractPriceRevenueParticipationRightsAvailableForRepurchase", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_DeferredOfferingCostsIncludedInAccountsPayableAndAccruedExpenses": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The deferred offering costs included in accounts payable and accrued expenses in noncash investing and financing activities.", "label": "Deferred Offering Costs Included in Accounts Payable and Accrued Expenses", "terseLabel": "Offering costs included in accounts payable and accrued expenses" } } }, "localname": "DeferredOfferingCostsIncludedInAccountsPayableAndAccruedExpenses", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "bhvn_DocumentAndEntityInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "", "label": "Document and Entity Information" } } }, "localname": "DocumentAndEntityInformationAbstract", "nsuri": "http://biohavenpharma.com/20180930", "xbrltype": "stringItemType" }, "bhvn_EquityMethodAdditionalSharesOfCommonStockToBePurchasedPerAgreement": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equity Method Additional Shares Of Common Stock To Be Purchased Per Agreement", "label": "Equity Method Additional Shares Of Common Stock To Be Purchased Per Agreement", "terseLabel": "Additional shares to be purchased per stock purchase agreement (shares)" } } }, "localname": "EquityMethodAdditionalSharesOfCommonStockToBePurchasedPerAgreement", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "sharesItemType" }, "bhvn_EquityMethodEqualTranchesOfCommonStockPurchasedPerAgreement": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the equity method shares to be purchased in four equal tranches.", "label": "Equity Method Equal Tranches Of Common Stock Purchased Per Agreement", "terseLabel": "Shares to be purchased in equal tranches (shares)", "verboseLabel": "Shares purchased in equal tranches (shares)" } } }, "localname": "EquityMethodEqualTranchesOfCommonStockPurchasedPerAgreement", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "sharesItemType" }, "bhvn_EquityMethodInvestmentCarryingValueRollForwardAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "NA", "label": "Equity Method Investment Carrying Value Roll Forward Abstract", "terseLabel": "Carrying value of equity method investment" } } }, "localname": "EquityMethodInvestmentCarryingValueRollForwardAbstract", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails" ], "xbrltype": "stringItemType" }, "bhvn_EquityMethodInvestmentsCashPaymentsForOfficerAndStockholderShares": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the cash payments for shares of stock purchased from the Chief Executive Officer in the equity investment agreement.", "label": "Equity Method Investments Cash Payments For Officer And Stockholder Shares", "terseLabel": "Cash payment for purchase of Kleo officer and stockholder shares" } } }, "localname": "EquityMethodInvestmentsCashPaymentsForOfficerAndStockholderShares", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_EquityMethodNumberOfEqualTranchesOfSharesToBePurchased": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the number of equal tranches of shares to be purchased.", "label": "Equity Method Number Of Equal Tranches Of Shares To Be Purchased", "terseLabel": "Number of equal tranches of shares to be purchased" } } }, "localname": "EquityMethodNumberOfEqualTranchesOfSharesToBePurchased", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "integerItemType" }, "bhvn_EquityMethodPricePerCommonShareOfStockPurchased": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the price per share of the stock purchased from equity investment.", "label": "Equity Method Price Per Common Share Of Stock Purchased", "terseLabel": "Price per share (in dollars per share)" } } }, "localname": "EquityMethodPricePerCommonShareOfStockPurchased", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "perShareItemType" }, "bhvn_EquityMethodSharesOfCommonStockFromChiefExecutiveOfficerPurchased": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the shares of stock purchased from the Chief Executive Officer in the equity investment agreement.", "label": "Equity Method Shares Of Common Stock From Chief Executive Officer Purchased", "terseLabel": "Shares of Kleo common stock purchased from co-founder (shares)" } } }, "localname": "EquityMethodSharesOfCommonStockFromChiefExecutiveOfficerPurchased", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "sharesItemType" }, "bhvn_EquityMethodSharesOfCommonStockPurchased": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the shares of stock purchased from equity investment.", "label": "Equity Method Shares Of Common Stock Purchased", "terseLabel": "Shares of Kleo common stock purchased (shares)" } } }, "localname": "EquityMethodSharesOfCommonStockPurchased", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "sharesItemType" }, "bhvn_EquityMethodSharesOfCommonStockPurchasedFromOfficerAndStockholder": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the shares of stock purchased from equity investment from Officer and Stockholder.", "label": "Equity Method Shares Of Common Stock Purchased From Officer And Stockholder", "terseLabel": "Issuance of common shares for purchase of Kleo office and stockholder shares (shares)" } } }, "localname": "EquityMethodSharesOfCommonStockPurchasedFromOfficerAndStockholder", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "sharesItemType" }, "bhvn_EquityMethodSharesOfCommonStockToBePurchasedPerAgreement": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equity Method Shares Of Common Stock To Be Purchased Per Agreement", "label": "Equity Method Shares Of Common Stock To Be Purchased Per Agreement", "terseLabel": "Shares to be purchased per stock purchase agreement (shares)" } } }, "localname": "EquityMethodSharesOfCommonStockToBePurchasedPerAgreement", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "sharesItemType" }, "bhvn_FairValueAdjustmentOfContingentEquityLiability": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 8.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Represents the change in the fair value of the contingent equity that is recognized as a component of other income.", "label": "Fair Value Adjustment Of Contingent Equity Liability", "terseLabel": "Change in fair value of contingent equity liability" } } }, "localname": "FairValueAdjustmentOfContingentEquityLiability", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "bhvn_FairValueAdjustmentOfContingentEquityLiabilityExcludingInitialCharge": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 5.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Represents the change in the fair value of the contingent equity that is recognized as a component of other income excluding the initial charge.", "label": "Fair Value Adjustment Of Contingent Equity Liability Excluding Initial Charge", "negatedLabel": "Change in fair value of contingent equity liability" } } }, "localname": "FairValueAdjustmentOfContingentEquityLiabilityExcludingInitialCharge", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "bhvn_FairValueAdjustmentOfDerivativeLiability": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 7.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 4.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Represents the change in the fair value of the derivative that is recognized as a component of other income.", "label": "Fair Value Adjustment Of Derivative Liability", "negatedLabel": "Change in fair value of derivative liability", "terseLabel": "Change in fair value of derivative liability" } } }, "localname": "FairValueAdjustmentOfDerivativeLiability", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "bhvn_FairValueInputsExpectedTimingOfTriggeringIssuanceOfShares": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the expected timing of event that was most probable of triggering the issuance of shares.", "label": "Fair Value Inputs, Expected Timing Of Triggering Issuance Of Shares", "terseLabel": "Expected timing of event that was most probable of triggering the issuance of shares" } } }, "localname": "FairValueInputsExpectedTimingOfTriggeringIssuanceOfShares", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "durationItemType" }, "bhvn_FirstTrancheMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the first tranche of contingently issuable equity.", "label": "First Tranche [Member]", "terseLabel": "First tranche" } } }, "localname": "FirstTrancheMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "bhvn_FixedAmountOfTranches": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the fixed dollar amount of tranches.", "label": "Fixed Amount Of Tranches", "terseLabel": "Fixed dollar amount per tranche" } } }, "localname": "FixedAmountOfTranches", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_FundingAgreementParticipationRightAnnualSalesThreshold": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Funding Agreement, Participation Right, Annual Sales Threshold", "label": "Funding Agreement, Participation Right, Annual Sales Threshold", "terseLabel": "Annual global net sales threshold for revenue participation right" } } }, "localname": "FundingAgreementParticipationRightAnnualSalesThreshold", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_FundingAgreementParticipationRightOnGlobalAnnualSalesPercentage": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Funding Agreement, Participation Right On Global Annual Sales, Percentage", "label": "Funding Agreement, Participation Right On Global Annual Sales, Percentage", "terseLabel": "Participation rate for revenue participation right (percent)" } } }, "localname": "FundingAgreementParticipationRightOnGlobalAnnualSalesPercentage", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "percentItemType" }, "bhvn_FundingAgreementRevenueParticipationRightAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Funding Agreement, Revenue Participation Right [Axis]", "label": "Funding Agreement, Revenue Participation Right [Axis]", "terseLabel": "Funding Agreement, Revenue Participation Right [Axis]" } } }, "localname": "FundingAgreementRevenueParticipationRightAxis", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "stringItemType" }, "bhvn_FundingAgreementRevenueParticipationRightDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Funding Agreement, Revenue Participation Right [Domain]", "label": "Funding Agreement, Revenue Participation Right [Domain]", "terseLabel": "Funding Agreement, Revenue Participation Right [Domain]" } } }, "localname": "FundingAgreementRevenueParticipationRightDomain", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "domainItemType" }, "bhvn_GuarantorAndCoGuarantorWarrantsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Pertains to the warrants issued to the Guarantor And Co-Guarantor of the Credit Agreement.", "label": "Guarantor and Co-Guarantor Warrants [Abstract]", "terseLabel": "Guarantor and Co-Guarantor Warrants" } } }, "localname": "GuarantorAndCoGuarantorWarrantsAbstract", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "stringItemType" }, "bhvn_GuarantorAndCoGuarantorWarrantsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the entity's warrants issued to each of the Guarantor and Co-Guarantor in exchange for guaranties.", "label": "Guarantor And Co Guarantor Warrants [Member]", "terseLabel": "Guarantor and Co-Guarantor Warrants" } } }, "localname": "GuarantorAndCoGuarantorWarrantsMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "bhvn_IssuanceOfSeriesPreferredStockAsPaymentOfOfferingCosts": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Issuance of Series A preferred stock as payment of offering costs in noncash investing and financing activities.", "label": "Issuance of Series Preferred Stock as Payment of Offering Costs", "terseLabel": "Issuance of Series A preferred shares as payment of offering costs" } } }, "localname": "IssuanceOfSeriesPreferredStockAsPaymentOfOfferingCosts", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "bhvn_KleoPharmaceuticalsIncEquityInvestmentMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the entity's stock purchase agreement with Kleo Pharmaceuticals, Inc, a company over which the entity exercise significant influence over the operating and financials policies.", "label": "Kleo Pharmaceuticals Inc Equity Investment [Member]", "terseLabel": "Kleo Pharmaceuticals, Inc." } } }, "localname": "KleoPharmaceuticalsIncEquityInvestmentMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "bhvn_KleoPharmaceuticalsIncMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the entity's equity investment in Kleo Pharmaceuticals, Inc (\"Kleo\").", "label": "Kleo Pharmaceuticals Inc [Member]", "terseLabel": "Kleo" } } }, "localname": "KleoPharmaceuticalsIncMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentProportionateShareOfNetLossDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "bhvn_LiabilityForSaleOfFutureRoyaltiesCarryingAmountGross": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesCarryingValueAndRelatedActivityDetails": { "order": 1.0, "parentTag": "bhvn_LiabilityForSaleOfFutureRoyaltiesCarryingAmountNet", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Liability For Sale Of Future Royalties, Carrying Amount, Gross", "label": "Liability For Sale Of Future Royalties, Carrying Amount, Gross", "terseLabel": "Liability related to sale of future royalties, gross" } } }, "localname": "LiabilityForSaleOfFutureRoyaltiesCarryingAmountGross", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesCarryingValueAndRelatedActivityDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_LiabilityForSaleOfFutureRoyaltiesCarryingAmountNet": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 2.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 }, "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesCarryingValueAndRelatedActivityDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Liability For Sale Of Future Royalties, Carrying Amount, Net", "label": "Liability For Sale Of Future Royalties, Carrying Amount, Net", "terseLabel": "Liability related to sale of future royalties, net", "totalLabel": "Liability related to sale of future royalties, net" } } }, "localname": "LiabilityForSaleOfFutureRoyaltiesCarryingAmountNet", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets", "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesCarryingValueAndRelatedActivityDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_LiabilityForSaleOfFutureRoyaltiesInitialAmountGross": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Liability For Sale Of Future Royalties, Initial Amount, Gross", "label": "Liability For Sale Of Future Royalties, Initial Amount, Gross", "terseLabel": "Transaction consideration allocated to liability", "verboseLabel": "Liability related to sale of future royalties, transaction date balance" } } }, "localname": "LiabilityForSaleOfFutureRoyaltiesInitialAmountGross", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesCarryingValueAndRelatedActivityDetails", "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_MeasurementInputProbabilityOfTriggeringEventMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Measurement Input, Probability Of Triggering Event [Member]", "label": "Measurement Input, Probability Of Triggering Event [Member]", "terseLabel": "Probability of Triggering Event" } } }, "localname": "MeasurementInputProbabilityOfTriggeringEventMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "bhvn_MilestonePaymentPaidByCompanyUponSpecifiedRegulatoryMilestoneAchievement": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the amount of milestone payment paid by the company upon the achievement of specified regulatory milestones and annual royalty payments based on net sales of products from patents.", "label": "Milestone Payment Paid By Company Upon Specified Regulatory Milestone Achievement", "terseLabel": "Upfront payment under the BMS Amendment" } } }, "localname": "MilestonePaymentPaidByCompanyUponSpecifiedRegulatoryMilestoneAchievement", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_MilestonePaymentToBePaidByCompanyUponSpecifiedRegulatoryAndCommercialMilestoneAchievement": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the amount of milestone payment to be paid by the company upon the achievement of specified regulatory and commercial milestones and annual royalty payments based on net sales of products from patents.", "label": "Milestone Payment To Be Paid By Company Upon Specified Regulatory And Commercial Milestone Achievement", "terseLabel": "Milestone payment due upon achievement of specified regulatory and commercial milestones" } } }, "localname": "MilestonePaymentToBePaidByCompanyUponSpecifiedRegulatoryAndCommercialMilestoneAchievement", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_MilestonePaymentToBePaidByCompanyUponSpecifiedRegulatoryMilestoneAchievement": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the amount of milestone payment to be paid by the company upon the achievement of specified regulatory milestones and annual royalty payments based on net sales of products from patents.", "label": "Milestone Payment to be Paid by Company Upon Specified Regulatory Milestone Achievement", "terseLabel": "Milestone payment to be paid" } } }, "localname": "MilestonePaymentToBePaidByCompanyUponSpecifiedRegulatoryMilestoneAchievement", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_MilestonePaymentToBePaidByCompanyUponSpecifiedSalesBasedMilestoneAchievement": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the amount of milestone payment to be paid by the company upon the achievement of specified sales-based milestones.", "label": "Milestone Payment To Be Paid By Company Upon Specified Sales Based Milestone Achievement", "terseLabel": "Milestone payment due upon achievement of specified sales-based milestones" } } }, "localname": "MilestonePaymentToBePaidByCompanyUponSpecifiedSalesBasedMilestoneAchievement", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_NewHeadquartersNewHavenCTMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "New Headquarters, New Haven, CT [Member]", "label": "New Headquarters, New Haven, CT [Member]", "terseLabel": "New headquarters, New Haven, CT" } } }, "localname": "NewHeadquartersNewHavenCTMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "domainItemType" }, "bhvn_NoncashInterestExpense": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 3.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of expense or loss included in net income that result in no cash flow, classified as interest expense.", "label": "Noncash Interest Expense", "terseLabel": "Non-cash interest expense" } } }, "localname": "NoncashInterestExpense", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "bhvn_NoncashInterestExpenseOnFutureRoyaltiesLiability": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 4.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 2.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Represents the noncash interest expense related to sale of future royalties.", "label": "Noncash Interest Expense On Future Royalties Liability", "negatedTerseLabel": "Non-cash interest expense on liability related to sale of future royalties", "terseLabel": "Non-cash interest expense on liability related to sale of future royalties" } } }, "localname": "NoncashInterestExpenseOnFutureRoyaltiesLiability", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "bhvn_NumberOfBoardOfDirectorEquityMethodInvestmentDesignatedMembers": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the number of members the Entity can designate to the Board of Directors per the equity method investment agreement.", "label": "Number Of Board Of Director Equity Method Investment Designated Members", "terseLabel": "Number to designate to Kleo's board of directors" } } }, "localname": "NumberOfBoardOfDirectorEquityMethodInvestmentDesignatedMembers", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "integerItemType" }, "bhvn_NumberOfDirectorsToWhomEntityAgreedToIssueWarrants": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of directors to whom the Company agreed to issue warrants to purchase common shares.", "label": "Number of Directors to Whom the Entity Agreed to Issue Warrants", "terseLabel": "Number of directors to whom the Company agreed to issue warrants" } } }, "localname": "NumberOfDirectorsToWhomEntityAgreedToIssueWarrants", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails", "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "integerItemType" }, "bhvn_NumberOfInventorsOfLicensedPatents": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the number of inventors of the patents the entity has licensed from Yale.", "label": "Number Of Inventors Of Licensed Patents", "terseLabel": "Number of inventors of licensed patents" } } }, "localname": "NumberOfInventorsOfLicensedPatents", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "integerItemType" }, "bhvn_NumberOfTranchesInWhichContingentEquityIsIssuable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the number of tranches in which contingently issuable equity is issuable.", "label": "Number Of Tranches In Which Contingent Equity Is Issuable", "terseLabel": "Number of tranches in which contingently issuable equity is issuable" } } }, "localname": "NumberOfTranchesInWhichContingentEquityIsIssuable", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "integerItemType" }, "bhvn_OfficeSpaceNewHavenCTMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Office Space, New Haven, CT [Member]", "label": "Office Space, New Haven, CT [Member]", "terseLabel": "Office space, New Haven, CT" } } }, "localname": "OfficeSpaceNewHavenCTMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "domainItemType" }, "bhvn_PaymentsOfUnderwritingDiscountsAndCommissionExpense": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow for cost incurred by underwriting discounts and commissions.", "label": "Payments Of Underwriting Discounts And Commission Expense", "terseLabel": "Underwriting discounts and commissions" } } }, "localname": "PaymentsOfUnderwritingDiscountsAndCommissionExpense", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_PercentageOfRevenueParticipationRightsAvailableForRepurchase": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Percentage Of Revenue Participation Rights Available For Repurchase", "label": "Percentage Of Revenue Participation Rights Available For Repurchase", "terseLabel": "Percentage of revenue participation rights available for repurchase (percent)" } } }, "localname": "PercentageOfRevenueParticipationRightsAvailableForRepurchase", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "percentItemType" }, "bhvn_PeriodOfTimeForPatentExpiration": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the equity method period of time that shares will be purchased after the initial closing.", "label": "Period of Time for Patent Expiration", "terseLabel": "Last patent right expiration period" } } }, "localname": "PeriodOfTimeForPatentExpiration", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "durationItemType" }, "bhvn_PrepaidExpenseAndOtherAssetsCurrentTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The entire definition of prepaid assets and other current asset.", "label": "Prepaid Expense And Other Assets Current [Text Block]", "terseLabel": "Prepaid Expenses and Other Current Assets" } } }, "localname": "PrepaidExpenseAndOtherAssetsCurrentTextBlock", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssets" ], "xbrltype": "textBlockItemType" }, "bhvn_ProceedsFromIssuanceOfCommonStockRelatedToSaleOfFutureRoyaltiesNetOfIssuanceCosts": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 3.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Proceeds From Issuance Of Common Stock Related To Sale Of Future Royalties, Net Of Issuance Costs", "label": "Proceeds From Issuance Of Common Stock Related To Sale Of Future Royalties, Net Of Issuance Costs", "terseLabel": "Proceeds from issuance of common stock related to sale of future royalties" } } }, "localname": "ProceedsFromIssuanceOfCommonStockRelatedToSaleOfFutureRoyaltiesNetOfIssuanceCosts", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "bhvn_ProceedsFromIssuanceOfInitialPublicOfferingAndUnderwritersIssuance": { "auth_ref": [], "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 and from the underwriters issuance.", "label": "Proceeds from Issuance of Initial Public Offering and Underwriters Issuance", "terseLabel": "Aggregate net proceeds from the IPO and underwriters issuance" } } }, "localname": "ProceedsFromIssuanceOfInitialPublicOfferingAndUnderwritersIssuance", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_ProceedsFromRoyaltyAgreement": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Proceeds received for royalty agreement.", "label": "Proceeds From Royalty Agreement", "terseLabel": "Proceeds from royalty agreement" } } }, "localname": "ProceedsFromRoyaltyAgreement", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_ProceedsSaleOfFutureRoyaltiesNetOfIssuanceCosts": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 2.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Proceeds Sale Of Future Royalties, Net Of Issuance Costs", "label": "Proceeds Sale Of Future Royalties, Net Of Issuance Costs", "terseLabel": "Proceeds from sale of future royalties" } } }, "localname": "ProceedsSaleOfFutureRoyaltiesNetOfIssuanceCosts", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "bhvn_RPIAgreementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "RPI Agreement [Member]", "label": "RPI Agreement [Member]", "terseLabel": "RPI Agreement" } } }, "localname": "RPIAgreementMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails" ], "xbrltype": "domainItemType" }, "bhvn_RPIFundingAgreementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "RPI Funding Agreement [Member]", "label": "RPI Funding Agreement [Member]", "terseLabel": "RPI Funding Agreement" } } }, "localname": "RPIFundingAgreementMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails" ], "xbrltype": "domainItemType" }, "bhvn_RPIPurchaseAgreementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "RPI Purchase Agreement [Member]", "label": "RPI Purchase Agreement [Member]", "terseLabel": "RPI Purchase Agreement" } } }, "localname": "RPIPurchaseAgreementMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "domainItemType" }, "bhvn_RefundReceivableCurrent": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails": { "order": 2.0, "parentTag": "us-gaap_PrepaidExpenseAndOtherAssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Refund Receivable, Current", "label": "Refund Receivable, Current", "terseLabel": "Refund receivable" } } }, "localname": "RefundReceivableCurrent", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_RevenueParticipationRightTrancheOneMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Revenue Participation Right, Tranche One [Member]", "label": "Revenue Participation Right, Tranche One [Member]", "terseLabel": "Revenue Participation Right, tranche one" } } }, "localname": "RevenueParticipationRightTrancheOneMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "domainItemType" }, "bhvn_RevenueParticipationRightTrancheTwoMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Revenue Participation Right, Tranche Two [Member]", "label": "Revenue Participation Right, Tranche Two [Member]", "terseLabel": "Revenue Participation Right, tranche two" } } }, "localname": "RevenueParticipationRightTrancheTwoMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "domainItemType" }, "bhvn_ScheduleOfCarryingValueOfEquityMethodInvestmentsTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the carrying amount of equity method investment.", "label": "Schedule of Carrying Value of Equity Method Investments [Table Text Block]", "terseLabel": "Schedule of carrying value of equity method investment" } } }, "localname": "ScheduleOfCarryingValueOfEquityMethodInvestmentsTableTextBlock", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentTables" ], "xbrltype": "textBlockItemType" }, "bhvn_ScheduleOfProportionateShareOfEquityInvestmentIncomeOrLossTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule Of Proportionate Share Of Equity Investment Income Or Loss [Table Text Block]", "label": "Schedule Of Proportionate Share Of Equity Investment Income Or Loss [Table Text Block]", "terseLabel": "Schedule of proportionate share of equity investment net loss" } } }, "localname": "ScheduleOfProportionateShareOfEquityInvestmentIncomeOrLossTableTextBlock", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentTables" ], "xbrltype": "textBlockItemType" }, "bhvn_ScheduleOfWarrantyLiabilityIncomeAndExpenseTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule Of Warranty Liability, Income And Expense [Table Text Block]", "label": "Schedule Of Warranty Liability, Income And Expense [Table Text Block]", "terseLabel": "Schedule of income (expense) related to warranty liability" } } }, "localname": "ScheduleOfWarrantyLiabilityIncomeAndExpenseTableTextBlock", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/WarrantsTables" ], "xbrltype": "textBlockItemType" }, "bhvn_SecondTrancheMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the second tranche of contingently issuable equity.", "label": "Second Tranche [Member]", "terseLabel": "Second tranche" } } }, "localname": "SecondTrancheMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "bhvn_StockIssuedDuringPeriodSharesWarrantsExercised": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The number of shares issued as a result of exercise of warrants.", "label": "Stock Issued During Period, Shares, Warrants Exercised", "verboseLabel": "Number of shares issued for exercise of warrants (shares)" } } }, "localname": "StockIssuedDuringPeriodSharesWarrantsExercised", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "sharesItemType" }, "bhvn_StockIssuedDuringPeriodValueEquityMethodInvestments": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value of shares issued as a consideration to Kleo under purchase agreement.", "label": "Stock Issued During the Period Value Equity Method Investments", "terseLabel": "Issuance of common shares as payment of equity investment", "verboseLabel": "Issuance of common shares as payment for equity investment" } } }, "localname": "StockIssuedDuringPeriodValueEquityMethodInvestments", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_StockIssuedDuringPeriodValueSettlementOfContingentEquity": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Equity impact of the value of stock issued during the period for settlement of contingent equity.", "label": "Stock Issued During Period, Value, Settlement Of Contingent Equity", "negatedTerseLabel": "Issuance of common shares in settlement of contingent equity liability", "terseLabel": "Issuance of common shares in settlement of contingent equity liability" } } }, "localname": "StockIssuedDuringPeriodValueSettlementOfContingentEquity", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_TemporaryEquityDisclosureTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for temporary equity.", "label": "Temporary Equity Disclosure [ Text Block ]", "terseLabel": "Convertible Preferred Shares" } } }, "localname": "TemporaryEquityDisclosureTextBlock", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/ConvertiblePreferredShares" ], "xbrltype": "textBlockItemType" }, "bhvn_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of new stock issued during the period classified as temporary equity.", "label": "Temporary Equity Stock Issued During Period Shares New Issues", "verboseLabel": "Preferred stock issued and sold (shares)" } } }, "localname": "TemporaryEquityStockIssuedDuringPeriodSharesNewIssues", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "sharesItemType" }, "bhvn_TotalAmountOfTranches": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the total amount of tranches.", "label": "Total Amount of Tranches", "terseLabel": "Total amount of tranches" } } }, "localname": "TotalAmountOfTranches", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_TransactionConsiderationAllocatedToEquity": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Transaction Consideration Allocated To Equity", "label": "Transaction Consideration Allocated To Equity", "terseLabel": "Transaction consideration allocated to equity" } } }, "localname": "TransactionConsiderationAllocatedToEquity", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "bhvn_WarrantsAndCreditAgreementsTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for warrants and credit agreements.", "label": "Warrants And Credit Agreements [Text Block]", "terseLabel": "Warrants" } } }, "localname": "WarrantsAndCreditAgreementsTextBlock", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/Warrants" ], "xbrltype": "textBlockItemType" }, "bhvn_WellsFargoTermLoanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Pertains to the term loan with Wells Fargo Bank, National Association.", "label": "Wells Fargo Term Loan [Member]", "terseLabel": "Wells Fargo Term Loan" } } }, "localname": "WellsFargoTermLoanMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "domainItemType" }, "bhvn_YaleLicenseAgreementTermsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents information pertaining to the entity's license agreement with Yale (the \"Yale agreement\") to obtain a license to certain patent rights for the commercial development, manufacture, distribution, use and sale of products and processes resulting from the development of those patent rights.", "label": "Yale License Agreement Terms [Member]", "terseLabel": "License Agreement with Yale" } } }, "localname": "YaleLicenseAgreementTermsMember", "nsuri": "http://biohavenpharma.com/20180930", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "dei_AmendmentFlag": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "If the value is true, then the document is an amendment to previously-filed/accepted document.", "label": "Amendment Flag", "terseLabel": "Amendment Flag" } } }, "localname": "AmendmentFlag", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "gMonthDayItemType" }, "dei_DocumentFiscalPeriodFocus": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY.", "label": "Document Fiscal Period Focus", "terseLabel": "Document Fiscal Period Focus" } } }, "localname": "DocumentFiscalPeriodFocus", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "fiscalPeriodItemType" }, "dei_DocumentFiscalYearFocus": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "This is focus fiscal year of the document report in CCYY 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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "gYearItemType" }, "dei_DocumentPeriodEndDate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.", "label": "Document Period End Date", "terseLabel": "Document Period End Date" } } }, "localname": "DocumentPeriodEndDate", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "dateItemType" }, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "submissionTypeItemType" }, "dei_EntityCentralIndexKey": { "auth_ref": [ "r248" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "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", "terseLabel": "Entity Common Stock, Shares Outstanding" } } }, "localname": "EntityCommonStockSharesOutstanding", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityEmergingGrowthCompany": { "auth_ref": [ "r248" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityExTransitionPeriod": { "auth_ref": [ "r249" ], "lang": { "en-US": { "role": { "documentation": "Indicate if registrant 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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityFilerCategory": { "auth_ref": [ "r248" ], "lang": { "en-US": { "role": { "documentation": "Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, (4) Smaller Reporting Company (Non-accelerated), (5) Smaller Reporting Accelerated Filer or (6) Smaller Reporting Company and Large 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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "filerCategoryItemType" }, "dei_EntityRegistrantName": { "auth_ref": [ "r248" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntitySmallBusiness": { "auth_ref": [ "r248" ], "lang": { "en-US": { "role": { "documentation": "Indicates that the company is a smaller reporting company with both a public float and revenues of less than $75 million.", "label": "Entity Small Business", "terseLabel": "Entity Small Business" } } }, "localname": "EntitySmallBusiness", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "srt_CounterpartyNameAxis": { "auth_ref": [ "r45", "r77" ], "lang": { "en-US": { "role": { "label": "Counterparty Name [Axis]", "terseLabel": "Counterparty Name [Axis]" } } }, "localname": "CounterpartyNameAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails", "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "stringItemType" }, "srt_EquityMethodInvesteeNameDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Investment, Name [Domain]", "terseLabel": "Investment, Name [Domain]" } } }, "localname": "EquityMethodInvesteeNameDomain", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentProportionateShareOfNetLossDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "srt_MaximumMember": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Maximum [Member]", "terseLabel": "Maximum" } } }, "localname": "MaximumMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "domainItemType" }, "srt_MinimumMember": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Minimum [Member]", "terseLabel": "Minimum" } } }, "localname": "MinimumMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "domainItemType" }, "srt_RangeAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Range [Axis]", "terseLabel": "Range [Axis]" } } }, "localname": "RangeAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "stringItemType" }, "srt_RangeMember": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Range [Domain]", "terseLabel": "Range [Domain]" } } }, "localname": "RangeMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails" ], "xbrltype": "domainItemType" }, "srt_RepurchaseAgreementCounterpartyNameDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Counterparty Name [Domain]", "terseLabel": "Counterparty Name [Domain]" } } }, "localname": "RepurchaseAgreementCounterpartyNameDomain", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails", "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "domainItemType" }, "srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis": { "auth_ref": [ "r106" ], "lang": { "en-US": { "role": { "label": "Investment, Name [Axis]", "terseLabel": "Investment, Name [Axis]" } } }, "localname": "ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentProportionateShareOfNetLossDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccountingPoliciesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Accounting Policies [Abstract]" } } }, "localname": "AccountingPoliciesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock": { "auth_ref": [ "r29" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period.", "label": "Accounts Payable and Accrued Liabilities Disclosure [Text Block]", "terseLabel": "Accrued Expenses" } } }, "localname": "AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/AccruedExpenses" ], "xbrltype": "textBlockItemType" }, "us-gaap_AccountsPayableCurrent": { "auth_ref": [ "r28" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 1.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccruedLiabilitiesCurrent": { "auth_ref": [ "r32" ], "calculation": { "http://biohavenpharma.com/role/AccruedExpensesDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 2.0, "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", "totalLabel": "Total accrued expenses" } } }, "localname": "AccruedLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/AccruedExpensesDetails", "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccruedLiabilitiesCurrentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Accrued Liabilities, Current [Abstract]", "terseLabel": "Accrued expenses" } } }, "localname": "AccruedLiabilitiesCurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/AccruedExpensesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccruedProfessionalFeesCurrent": { "auth_ref": [ "r7", "r8", "r32" ], "calculation": { "http://biohavenpharma.com/role/AccruedExpensesDetails": { "order": 3.0, "parentTag": "us-gaap_AccruedLiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).", "label": "Accrued Professional Fees, Current", "terseLabel": "Accrued professional fees" } } }, "localname": "AccruedProfessionalFeesCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/AccruedExpensesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdditionalPaidInCapital": { "auth_ref": [ "r20" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 2.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "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. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.", "label": "Additional Paid in Capital", "terseLabel": "Additional paid-in capital" } } }, "localname": "AdditionalPaidInCapital", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Adjustments, Noncash Items, 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": "AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": { "auth_ref": [ "r146", "r148", "r152", "r153" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.", "label": "Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition", "terseLabel": "Share-based compensation expense" } } }, "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued": { "auth_ref": [ "r122", "r131", "r138" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.", "label": "Adjustments to Additional Paid in Capital, Warrant Issued", "terseLabel": "Issuance of common share warrant as consideration for services" } } }, "localname": "AdjustmentsToAdditionalPaidInCapitalWarrantIssued", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AmortizationOfDebtDiscountPremium": { "auth_ref": [ "r52", "r66", "r186" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.", "label": "Amortization of Debt Discount (Premium)", "verboseLabel": "Accretion of debt discount" } } }, "localname": "AmortizationOfDebtDiscountPremium", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": { "auth_ref": [ "r88" ], "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": "Anti-dilutive securities excluded from calculation of diluted net loss per share" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareAntidilutiveSecuritiesExcludedFromComputationOfNetLossPerShareDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis": { "auth_ref": [ "r88" ], "lang": { "en-US": { "role": { "documentation": "Information by type of antidilutive security.", "label": "Antidilutive Securities [Axis]", "terseLabel": "Antidilutive Securities [Axis]" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareAntidilutiveSecuritiesExcludedFromComputationOfNetLossPerShareDetails" ], "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": "Securities excluded from computation of diluted net loss per share" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareAntidilutiveSecuritiesExcludedFromComputationOfNetLossPerShareDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AntidilutiveSecuritiesNameDomain": { "auth_ref": [ "r88" ], "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 [Domain]" } } }, "localname": "AntidilutiveSecuritiesNameDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareAntidilutiveSecuritiesExcludedFromComputationOfNetLossPerShareDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ArrangementsAndNonarrangementTransactionsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "This item is to be populated with the collective of (i) types (categories) of arrangements of the entity applicable to its revenue-generating activities or operations and non-arrangement transactions, including but not limited to, for instance, sales of product manufactured by the entity, if such comparison of arrangements as a component of all transactions is provided by the entity.", "label": "Arrangements and Non-arrangement Transactions [Domain]", "terseLabel": "Arrangements and Non-arrangement Transactions [Domain]" } } }, "localname": "ArrangementsAndNonarrangementTransactionsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_Assets": { "auth_ref": [ "r101", "r231", "r241" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets [Abstract]", "terseLabel": "Assets" } } }, "localname": "AssetsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsCurrent": { "auth_ref": [ "r4", "r6", "r42" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 1.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsFairValueDisclosure": { "auth_ref": [ "r170" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.", "label": "Assets, Fair Value Disclosure", "terseLabel": "Financial assets at fair value" } } }, "localname": "AssetsFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "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": "Unaudited Interim Condensed Consolidated Financial Information" } } }, "localname": "BasisOfAccountingPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/SummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock": { "auth_ref": [ "r84" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for the basis of presentation and significant accounting policies concepts. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). Accounting policies describe all significant accounting policies of the reporting entity.", "label": "Basis of Presentation and Significant Accounting Policies [Text Block]", "terseLabel": "Summary of Significant Accounting Policies" } } }, "localname": "BasisOfPresentationAndSignificantAccountingPoliciesTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/SummaryOfSignificantAccountingPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_BoardOfDirectorsChairmanMember": { "auth_ref": [ "r205" ], "lang": { "en-US": { "role": { "documentation": "Leader of the entity's board of directors who presides over board meetings and other board activities. The chairman is often the chief executive officer as well, and in such a case would be the entity's highest ranking officer.", "label": "Board of Directors Chairman [Member]", "terseLabel": "Shareholders and members of the Board of Directors" } } }, "localname": "BoardOfDirectorsChairmanMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CapitalLeaseObligationsCurrent": { "auth_ref": [ "r14", "r194", "r195" ], "calculation": { "http://biohavenpharma.com/role/AccruedExpensesDetails": { "order": 2.0, "parentTag": "us-gaap_AccruedLiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of capital lease obligation due within one year or the normal operating cycle, if longer.", "label": "Capital Lease Obligations, Current", "terseLabel": "Accrued lease liability" } } }, "localname": "CapitalLeaseObligationsCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/AccruedExpensesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashAndCashEquivalentsAtCarryingValue": { "auth_ref": [ "r1", "r25", "r68" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 1.0, "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", "periodEndLabel": "Cash at end of period", "periodStartLabel": "Cash at beginning of period", "terseLabel": "Cash" } } }, "localname": "CashAndCashEquivalentsAtCarryingValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets", "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the 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. Includes effect from exchange rate changes.", "label": "Cash and Cash Equivalents, Period Increase (Decrease)", "totalLabel": "Net increase in cash" } } }, "localname": "CashAndCashEquivalentsPeriodIncreaseDecrease", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ClassOfStockDomain": { "auth_ref": [], "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 [Domain]" } } }, "localname": "ClassOfStockDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ClassOfWarrantOrRightAxis": { "auth_ref": [ "r82", "r139", "r140", "r147" ], "lang": { "en-US": { "role": { "documentation": "Information by type of warrant or right issued.", "label": "Class of Warrant or Right [Axis]", "terseLabel": "Class of Warrant or Right [Axis]" } } }, "localname": "ClassOfWarrantOrRightAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ClassOfWarrantOrRightDomain": { "auth_ref": [ "r75" ], "lang": { "en-US": { "role": { "documentation": "Name of the class or type of warrant or right outstanding. Warrants and rights represent derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months.", "label": "Class of Warrant or Right [Domain]", "terseLabel": "Class of Warrant or Right [Domain]" } } }, "localname": "ClassOfWarrantOrRightDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1": { "auth_ref": [ "r81" ], "lang": { "en-US": { "role": { "documentation": "Exercise price per share or per unit of warrants or rights outstanding.", "label": "Class of Warrant or Right, Exercise Price of Warrants or Rights", "terseLabel": "Exercise price of warrants (per share)" } } }, "localname": "ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ClassOfWarrantOrRightLineItems": { "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 Warrant or Right [Line Items]", "terseLabel": "Warrants" } } }, "localname": "ClassOfWarrantOrRightLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.", "label": "Class of Warrant or Right, Number of Securities Called by Each Warrant or Right", "terseLabel": "Exercise of warrants, net settlement of shares (shares)" } } }, "localname": "ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ClassOfWarrantOrRightTable": { "auth_ref": [ "r75", "r139", "r140", "r147" ], "lang": { "en-US": { "role": { "documentation": "Disclosure for warrants or rights issued, which includes the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.", "label": "Class of Warrant or Right [Table]", "terseLabel": "Class of Warrant or Right [Table]" } } }, "localname": "ClassOfWarrantOrRightTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CollaborativeArrangementDisclosureTextBlock": { "auth_ref": [ "r158" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for collaborative arrangements in which the entity is a participant, including a) information about the nature and purpose of such arrangements; b) its rights and obligations thereunder; c) the accounting policy for collaborative arrangements; and d) the income statement classification and amounts attributable to transactions arising from the collaborative arrangement between participants.", "label": "Collaborative Arrangement Disclosure [Text Block]", "terseLabel": "License and Other Agreements" } } }, "localname": "CollaborativeArrangementDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreements" ], "xbrltype": "textBlockItemType" }, "us-gaap_CollaborativeArrangementMember": { "auth_ref": [ "r157" ], "lang": { "en-US": { "role": { "documentation": "Contractual arrangement that involves two or more parties that both: (i) actively participate in a joint operating activity and (ii) are exposed to significant risks and rewards that depend on the commercial success of the joint operating activity.", "label": "Collaborative Arrangement [Member]", "terseLabel": "Collaborative arrangement" } } }, "localname": "CollaborativeArrangementMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems": { "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": "Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]", "terseLabel": "License and other agreements" } } }, "localname": "CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CommitmentsAndContingencies": { "auth_ref": [ "r37", "r118", "r235", "r245" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 2.0, "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 and contingencies" } } }, "localname": "CommitmentsAndContingencies", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "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/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": { "auth_ref": [ "r117", "r119" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for commitments and contingencies.", "label": "Commitments and Contingencies Disclosure [Text Block]", "terseLabel": "Commitments and Contingencies" } } }, "localname": "CommitmentsAndContingenciesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingencies" ], "xbrltype": "textBlockItemType" }, "us-gaap_CommonStockNoParValue": { "auth_ref": [ "r19" ], "lang": { "en-US": { "role": { "documentation": "Face amount per share of no-par value common stock.", "label": "Common Stock, No Par Value", "terseLabel": "Common shares, par value (in dollars per share)" } } }, "localname": "CommonStockNoParValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockSharesAuthorized": { "auth_ref": [ "r19" ], "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 shares, authorized (shares)" } } }, "localname": "CommonStockSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesIssued": { "auth_ref": [ "r19" ], "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 shares, issued (shares)" } } }, "localname": "CommonStockSharesIssued", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesOutstanding": { "auth_ref": [ "r19", "r131" ], "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 shares, outstanding (shares)" } } }, "localname": "CommonStockSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockValue": { "auth_ref": [ "r19" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 1.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "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, Issued", "terseLabel": "Fair value of common shares", "verboseLabel": "Common shares, no par value; 200,000,000 shares authorized as of September 30, 2018 and December 31, 2017; 40,261,750 and 36,057,748 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively" } } }, "localname": "CommonStockValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ConversionOfStockSharesIssued1": { "auth_ref": [ "r70", "r71", "r72" ], "lang": { "en-US": { "role": { "documentation": "The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.", "label": "Conversion of Stock, Shares Issued", "terseLabel": "Shares issued on conversion of preferred stock (shares)" } } }, "localname": "ConversionOfStockSharesIssued1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ConvertiblePreferredStockMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Preferred stock that may be exchanged into common shares or other types of securities at the owner's option.", "label": "Convertible Preferred Stock [Member]", "terseLabel": "Series A Convertible Preferred Shares" } } }, "localname": "ConvertiblePreferredStockMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DebtDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Debt Disclosure [Abstract]" } } }, "localname": "DebtDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_DebtDisclosureTextBlock": { "auth_ref": [ "r125" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.", "label": "Debt Disclosure [Text Block]", "terseLabel": "Liability Related to Sale of Future Royalties" } } }, "localname": "DebtDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyalties" ], "xbrltype": "textBlockItemType" }, "us-gaap_DebtInstrumentAxis": { "auth_ref": [ "r14", "r15", "r16", "r232", "r233", "r239" ], "lang": { "en-US": { "role": { "documentation": "Information by type of debt instrument, including, but not limited to, draws against credit facilities.", "label": "Debt Instrument [Axis]", "terseLabel": "Debt Instrument [Axis]" } } }, "localname": "DebtInstrumentAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails", "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentFaceAmount": { "auth_ref": [ "r187", "r189" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Face (par) amount of debt instrument at time of issuance.", "label": "Debt Instrument, Face Amount", "terseLabel": "Principal amount" } } }, "localname": "DebtInstrumentFaceAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtInstrumentInterestRateEffectivePercentage": { "auth_ref": [ "r34", "r123", "r187" ], "lang": { "en-US": { "role": { "documentation": "Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.", "label": "Debt Instrument, Interest Rate, Effective Percentage", "terseLabel": "Effective interest rate (percent)" } } }, "localname": "DebtInstrumentInterestRateEffectivePercentage", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DebtInstrumentLineItems": { "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": "Debt Instrument [Line Items]", "terseLabel": "Liability For Sale of Future Royalties [Line Items]" } } }, "localname": "DebtInstrumentLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentNameDomain": { "auth_ref": [ "r35" ], "lang": { "en-US": { "role": { "documentation": "The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities.", "label": "Debt Instrument, Name [Domain]", "terseLabel": "Debt Instrument, Name [Domain]" } } }, "localname": "DebtInstrumentNameDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails", "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DebtInstrumentTable": { "auth_ref": [ "r35", "r79", "r132", "r135", "r136", "r137", "r186", "r187", "r189", "r238" ], "lang": { "en-US": { "role": { "documentation": "A table or schedule providing information pertaining to long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.", "label": "Schedule of Long-term Debt Instruments [Table]", "terseLabel": "Schedule of Long-term Debt Instruments [Table]" } } }, "localname": "DebtInstrumentTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/LicenseAndOtherAgreementsRevenueParticipationRightsWithRpiFinanceTrustDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentTerm": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Debt Instrument, Term", "terseLabel": "Credit agreement term" } } }, "localname": "DebtInstrumentTerm", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "durationItemType" }, "us-gaap_DebtPolicyTextBlock": { "auth_ref": [ "r73", "r121" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy related to debt. Includes, but is not limited to, debt issuance costs, the effects of refinancings, method of amortizing debt issuance costs and original issue discount, and classifications of debt.", "label": "Debt, Policy [Policy Text Block]", "terseLabel": "Non-Cash Interest Expense on Liability Related to Sale of Future Royalties" } } }, "localname": "DebtPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/SummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock": { "auth_ref": [ "r27" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs.", "label": "Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]", "terseLabel": "Schedule of prepaid expenses and other current assets" } } }, "localname": "DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_DeferredFinanceCostsGross": { "auth_ref": [ "r188" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.", "label": "Debt Issuance Costs, Gross", "terseLabel": "Transaction costs", "verboseLabel": "Issuance costs" } } }, "localname": "DeferredFinanceCostsGross", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredFinanceCostsNet": { "auth_ref": [ "r27", "r188" ], "calculation": { "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesCarryingValueAndRelatedActivityDetails": { "order": 2.0, "parentTag": "bhvn_LiabilityForSaleOfFutureRoyaltiesCarryingAmountNet", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.", "label": "Debt Issuance Costs, Net", "negatedTerseLabel": "Less: Unamortized transaction costs" } } }, "localname": "DeferredFinanceCostsNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesCarryingValueAndRelatedActivityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeLiabilities": { "auth_ref": [ "r43", "r44", "r181" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.", "label": "Derivative Liability", "terseLabel": "Warranty liability", "verboseLabel": "Derivative liability" } } }, "localname": "DerivativeLiabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeMember": { "auth_ref": [ "r168" ], "lang": { "en-US": { "role": { "documentation": "This element represents types of derivative financial instruments which are financial instruments or other contractual arrangements with all three of the following characteristics: (a) it has (1) one or more underlyings and (2) one or more notional amounts or payment provisions or both. Those terms determine the amount of the settlement or settlements, and, in some cases, whether or not a settlement is required; (b) it requires no initial net investment or an initial net investment that is smaller than would be required for other types of contracts that would be expected to have a similar response to changes in market factors; and (c) its terms require or permit net settlement, it can readily be settled net by a means outside the contract, or it provides for delivery of an asset that puts the recipient in a position not substantially different from net settlement. Notwithstanding the above characteristics, loan commitments that relate to the origination of mortgage loans that will be held for sale are accounted for as derivative instruments by the issuer of the loan commitment (that is, the potential lender).", "label": "Derivative [Member]", "terseLabel": "Derivative Liability" } } }, "localname": "DerivativeMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DirectorMember": { "auth_ref": [ "r205" ], "lang": { "en-US": { "role": { "documentation": "Person serving on the board of directors (who collectively have responsibility for governing the entity).", "label": "Director [Member]", "terseLabel": "Directors" } } }, "localname": "DirectorMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails", "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DueToRelatedPartiesCurrent": { "auth_ref": [ "r28", "r83", "r203" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).", "label": "Due to Related Parties, Current", "terseLabel": "Payments due to related party" } } }, "localname": "DueToRelatedPartiesCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EarningsPerShareAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Earnings Per Share [Abstract]" } } }, "localname": "EarningsPerShareAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_EarningsPerShareBasicAndDiluted": { "auth_ref": [ "r87" ], "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 attributable to common shareholders of Biohaven Pharmaceutical Holding Company Ltd. \u2014 basic and diluted (in dollars per share)", "verboseLabel": "Net loss per share attributable to common shareholders of Biohaven Pharmaceutical Holding Company Ltd.-basic and diluted (in dollars per share)" } } }, "localname": "EarningsPerShareBasicAndDiluted", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss", "http://biohavenpharma.com/role/NetLossPerShareCalculationOfBasicAndDilutedNetLossPerShareDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerShareTextBlock": { "auth_ref": [ "r90" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for earnings per share.", "label": "Earnings Per Share [Text Block]", "terseLabel": "Net Loss per Share" } } }, "localname": "EarningsPerShareTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShare" ], "xbrltype": "textBlockItemType" }, "us-gaap_EmployeeRelatedLiabilitiesCurrent": { "auth_ref": [ "r32" ], "calculation": { "http://biohavenpharma.com/role/AccruedExpensesDetails": { "order": 4.0, "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": "Accrued employee compensation and benefits" } } }, "localname": "EmployeeRelatedLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/AccruedExpensesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeStockOptionMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "An arrangement whereby an employee is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement. Although there are variations, normally, after vesting, when an option is exercised, the employee-holder pays the strike value in cash to the issuing employer-entity and receives equity shares. The equity shares can be sold into the market for cash at the current market price without restriction. Options may be used to attract, retain and incentivize employees, in addition to their regular salary and other benefits.", "label": "Employee Stock Option [Member]", "terseLabel": "Options to purchase common shares" } } }, "localname": "EmployeeStockOptionMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareAntidilutiveSecuritiesExcludedFromComputationOfNetLossPerShareDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EquityMethodInvesteeMember": { "auth_ref": [ "r104", "r219", "r221", "r223", "r225", "r227", "r229" ], "lang": { "en-US": { "role": { "documentation": "An entity that issued voting stock held by an investor and that is accounted for under the equity method of accounting by the investor.", "label": "Equity Method Investee [Member]", "terseLabel": "Equity Investment" } } }, "localname": "EquityMethodInvesteeMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EquityMethodInvestmentOwnershipPercentage": { "auth_ref": [ "r106" ], "lang": { "en-US": { "role": { "documentation": "The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.", "label": "Equity Method Investment, Ownership Percentage", "terseLabel": "Ownership percentage" } } }, "localname": "EquityMethodInvestmentOwnershipPercentage", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EquityMethodInvestments": { "auth_ref": [ "r26", "r102", "r105" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 2.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.", "label": "Equity Method Investments", "periodEndLabel": "Ending balance", "periodStartLabel": "Beginning balance", "terseLabel": "Equity method investment", "verboseLabel": "Carrying value of investment" } } }, "localname": "EquityMethodInvestments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets", "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EquityMethodInvestmentsAndJointVenturesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Equity Method Investments and Joint Ventures [Abstract]" } } }, "localname": "EquityMethodInvestmentsAndJointVenturesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_EquityMethodInvestmentsDisclosureTextBlock": { "auth_ref": [ "r108" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.", "label": "Equity Method Investments and Joint Ventures Disclosure [Text Block]", "terseLabel": "Equity Method Investment" } } }, "localname": "EquityMethodInvestmentsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestment" ], "xbrltype": "textBlockItemType" }, "us-gaap_ExecutiveOfficerMember": { "auth_ref": [ "r205" ], "lang": { "en-US": { "role": { "documentation": "One of the ranking officers of the entity, appointed to the position by the board of directors.", "label": "Executive Officer [Member]", "terseLabel": "Chief Executive Officer" } } }, "localname": "ExecutiveOfficerMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueAdjustmentOfWarrants": { "auth_ref": [ "r66", "r126" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 6.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 3.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of expense (income) related to adjustment to fair value of warrant liability.", "label": "Fair Value Adjustment of Warrants", "negatedLabel": "Change in fair value of warrant liability", "negatedTerseLabel": "Income (expense) from change in fair value of warrant liability", "terseLabel": "Change in fair value of warrant liability" } } }, "localname": "FairValueAdjustmentOfWarrants", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss", "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems": { "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 and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]", "terseLabel": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]" } } }, "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": { "auth_ref": [ "r169", "r170", "r171", "r172", "r178", "r179" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.", "label": "Fair Value Measurements, Recurring and Nonrecurring [Table]", "terseLabel": "Fair Value Measurements, Recurring and Nonrecurring [Table]" } } }, "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByFairValueHierarchyLevelAxis": { "auth_ref": [ "r142", "r143", "r145", "r171", "r212" ], "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 Hierarchy and NAV [Axis]", "terseLabel": "Fair Value Hierarchy and NAV [Axis]" } } }, "localname": "FairValueByFairValueHierarchyLevelAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByLiabilityClassAxis": { "auth_ref": [ "r177", "r179" ], "lang": { "en-US": { "role": { "documentation": "Information by class of liability.", "label": "Liability Class [Axis]", "terseLabel": "Liability Class [Axis]" } } }, "localname": "FairValueByLiabilityClassAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByMeasurementFrequencyAxis": { "auth_ref": [ "r169" ], "lang": { "en-US": { "role": { "documentation": "Information by measurement frequency.", "label": "Measurement Frequency [Axis]", "terseLabel": "Measurement Frequency [Axis]" } } }, "localname": "FairValueByMeasurementFrequencyAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueDisclosuresAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Fair Value Disclosures [Abstract]" } } }, "localname": "FairValueDisclosuresAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_FairValueDisclosuresTextBlock": { "auth_ref": [ "r180" ], "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 Assets and Liabilities" } } }, "localname": "FairValueDisclosuresTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilities" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueInputsLevel1Member": { "auth_ref": [ "r142", "r143", "r145", "r171", "r213" ], "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, Level 1 [Member]", "terseLabel": "Level 1" } } }, "localname": "FairValueInputsLevel1Member", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel2Member": { "auth_ref": [ "r142", "r143", "r145", "r171", "r214" ], "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, Level 2 [Member]", "terseLabel": "Level 2" } } }, "localname": "FairValueInputsLevel2Member", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel3Member": { "auth_ref": [ "r142", "r143", "r145", "r171", "r215" ], "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, Level 3 [Member]", "terseLabel": "Level 3" } } }, "localname": "FairValueInputsLevel3Member", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain": { "auth_ref": [ "r175", "r179" ], "lang": { "en-US": { "role": { "documentation": "Represents classes of liabilities measured and disclosed at fair value.", "label": "Fair Value by Liability Class [Domain]", "terseLabel": "Fair Value by Liability Class [Domain]" } } }, "localname": "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]", "terseLabel": "Rollforward of Liabilities Measured by Level 3 Inputs:" } } }, "localname": "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems": { "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, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]", "terseLabel": "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]" } } }, "localname": "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable": { "auth_ref": [ "r175", "r179" ], "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 liabilities using significant unobservable inputs (level 3). Separately presenting changes during the period, attributable to: (1) total gains or losses for the period (realized and unrealized) and location reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); (3) transfers in and/or out of Level 3.", "label": "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]", "terseLabel": "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]" } } }, "localname": "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock": { "auth_ref": [ "r175", "r179" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (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 (loss) 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 liability.", "label": "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]", "terseLabel": "Summary of roll forward of aggregate fair values of the warrant liability, derivative liability and contingent equity liability" } } }, "localname": "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueMeasurementFrequencyDomain": { "auth_ref": [ "r169", "r177" ], "lang": { "en-US": { "role": { "documentation": "Provides the general categories used to describe the frequency with which financial assets and liabilities (as defined) are measured at fair value (on a recurring or nonrecurring basis).", "label": "Fair Value, Measurement Frequency [Domain]", "terseLabel": "Fair Value, Measurement Frequency [Domain]" } } }, "localname": "FairValueMeasurementFrequencyDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings": { "auth_ref": [ "r176" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability 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, Liability, Gain (Loss) Included in Earnings", "negatedTerseLabel": "Change in fair value" } } }, "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue": { "auth_ref": [ "r175" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Fair value of financial instrument classified as a liability 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, Liability Value", "periodEndLabel": "Ending balance", "periodStartLabel": "Beginning balance" } } }, "localname": "FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.", "label": "Fair Value Hierarchy and NAV [Domain]", "terseLabel": "Fair Value Hierarchy and NAV [Domain]" } } }, "localname": "FairValueMeasurementsFairValueHierarchyDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementsRecurringMember": { "auth_ref": [ "r169", "r177" ], "lang": { "en-US": { "role": { "documentation": "This item represents a description of the frequency with which certain items are measured at fair value. Items measured at fair value on a recurring basis generally include those items for which measurement inputs are readily available and which are measured at fair value at successive reporting periods.", "label": "Fair Value, Measurements, Recurring [Member]", "terseLabel": "Recurring" } } }, "localname": "FairValueMeasurementsRecurringMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueOptionQuantitativeDisclosuresTable": { "auth_ref": [ "r182", "r183", "r184" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about asset and liability measured at fair value under fair value option.", "label": "Fair Value Option, Disclosures [Table]", "terseLabel": "Fair Value Option, Disclosures [Table]" } } }, "localname": "FairValueOptionQuantitativeDisclosuresTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancialInstrumentAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by type of financial instrument.", "label": "Financial Instrument [Axis]", "terseLabel": "Financial Instrument [Axis]" } } }, "localname": "FinancialInstrumentAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinancialLiabilitiesFairValueDisclosure": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.", "label": "Financial Liabilities Fair Value Disclosure", "terseLabel": "Financial liabilities at fair value", "verboseLabel": "Fair value of financial liabilities" } } }, "localname": "FinancialLiabilitiesFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinancialLiabilitiesFairValueDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Financial Liabilities Fair Value Disclosure [Abstract]", "terseLabel": "Liabilities:" } } }, "localname": "FinancialLiabilitiesFairValueDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetUsefulLife": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Finite-Lived Intangible Asset, Useful Life", "terseLabel": "Agreement time period" } } }, "localname": "FiniteLivedIntangibleAssetUsefulLife", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails" ], "xbrltype": "durationItemType" }, "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis": { "auth_ref": [ "r111", "r112", "r114", "r115", "r217" ], "lang": { "en-US": { "role": { "documentation": "Information by major type or class of finite-lived intangible assets.", "label": "Finite-Lived Intangible Assets by Major Class [Axis]", "terseLabel": "Finite-Lived Intangible Assets by Major Class [Axis]" } } }, "localname": "FiniteLivedIntangibleAssetsByMajorClassAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsLineItems": { "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": "Finite-Lived Intangible Assets [Line Items]", "terseLabel": "Finite-Lived Intangible Assets [Line Items]" } } }, "localname": "FiniteLivedIntangibleAssetsLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain": { "auth_ref": [ "r111", "r113" ], "lang": { "en-US": { "role": { "documentation": "The major class of finite-lived intangible asset (for example, patents, trademarks, copyrights, etc.) A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.", "label": "Finite-Lived Intangible Assets, Major Class Name [Domain]", "terseLabel": "Finite-Lived Intangible Assets, Major Class Name [Domain]" } } }, "localname": "FiniteLivedIntangibleAssetsMajorClassNameDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_GeneralAndAdministrativeExpense": { "auth_ref": [ "r50" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 1.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "us-gaap_IPOMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "First sale of stock by a private company to the public.", "label": "IPO [Member]", "terseLabel": "IPO", "verboseLabel": "Initial Public Offering" } } }, "localname": "IPOMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments": { "auth_ref": [ "r80" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 1.0, "parentTag": "us-gaap_ProfitLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.", "label": "Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest", "totalLabel": "Loss before provision for income taxes" } } }, "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeLossFromEquityMethodInvestments": { "auth_ref": [ "r49", "r66", "r99", "r105", "r236", "r246" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 9.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 }, "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 6.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.", "label": "Income (Loss) from Equity Method Investments", "negatedLabel": "Loss from equity method investment", "negatedTerseLabel": "Proportionate share of Kleo's net loss", "terseLabel": "Loss from equity method investment", "verboseLabel": "Loss recognized in connection with equity method investment" } } }, "localname": "IncomeLossFromEquityMethodInvestments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss", "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentProportionateShareOfNetLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeStatementAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Income Statement [Abstract]" } } }, "localname": "IncomeStatementAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxExpenseBenefit": { "auth_ref": [ "r74", "r100", "r155" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 2.0, "parentTag": "us-gaap_ProfitLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.", "label": "Income Tax Expense (Benefit)", "terseLabel": "Provision for income taxes" } } }, "localname": "IncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeTaxesPaidNet": { "auth_ref": [ "r69" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.", "label": "Income Taxes Paid, Net", "terseLabel": "Cash paid for income taxes" } } }, "localname": "IncomeTaxesPaidNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccountsPayable": { "auth_ref": [ "r65" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 14.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccruedLiabilities": { "auth_ref": [ "r65" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 15.0, "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 expenses incurred but not yet paid.", "label": "Increase (Decrease) in Accrued Liabilities", "terseLabel": "Accrued expenses" } } }, "localname": "IncreaseDecreaseInAccruedLiabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInDeferredIncomeTaxes": { "auth_ref": [ "r65" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 12.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.", "label": "Increase (Decrease) in Deferred Income Taxes", "negatedTerseLabel": "Deferred tax assets" } } }, "localname": "IncreaseDecreaseInDeferredIncomeTaxes", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_IncreaseDecreaseInOtherNoncurrentAssets": { "auth_ref": [ "r65" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 13.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in noncurrent assets classified as other.", "label": "Increase (Decrease) in Other Noncurrent Assets", "negatedTerseLabel": "Other assets" } } }, "localname": "IncreaseDecreaseInOtherNoncurrentAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 16.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in noncurrent operating liabilities classified as other.", "label": "Increase (Decrease) in Other Noncurrent Liabilities", "terseLabel": "Other long-term liabilities" } } }, "localname": "IncreaseDecreaseInOtherNoncurrentLiabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets": { "auth_ref": [ "r65" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 11.0, "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 Expense and Other Assets", "negatedLabel": "Prepaid expenses and other current assets" } } }, "localname": "IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInStockholdersEquityRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Increase (Decrease) in Stockholders' Equity [Roll Forward]", "terseLabel": "Increase (Decrease) in Stockholders' Equity [Roll Forward]" } } }, "localname": "IncreaseDecreaseInStockholdersEquityRollForward", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_InterestExpense": { "auth_ref": [ "r48", "r98", "r185", "r188", "r237" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 1.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of the cost of borrowed funds accounted for as interest expense.", "label": "Interest Expense", "negatedLabel": "Interest expense" } } }, "localname": "InterestExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpenseDebt": { "auth_ref": [ "r52", "r124" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of the cost of borrowed funds accounted for as interest expense for debt.", "label": "Interest Expense, Debt", "terseLabel": "Interest expense" } } }, "localname": "InterestExpenseDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpenseOther": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of interest expense classified as other.", "label": "Interest Expense, Other", "terseLabel": "Non-cash interest expense recognized, net of transaction cost amortization" } } }, "localname": "InterestExpenseOther", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesCarryingValueAndRelatedActivityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestPaidNet": { "auth_ref": [ "r60", "r63", "r69" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.", "label": "Interest Paid, Excluding Capitalized Interest, Operating Activities", "terseLabel": "Cash paid for interest" } } }, "localname": "InterestPaidNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_LeaseAndRentalExpense": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.", "label": "Operating Leases, Rent Expense", "terseLabel": "Rent expense" } } }, "localname": "LeaseAndRentalExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LeaseArrangementTypeAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by group of related lease arrangements. For example, but not limited to, leases grouped by facility or contractual terms.", "label": "Lease Arrangement, Type [Axis]", "terseLabel": "Lease Arrangement, Type [Axis]" } } }, "localname": "LeaseArrangementTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LeaseArrangementTypeDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Group of related lease arrangements. For example, but not limited to, leases grouped by facility or contractual terms.", "label": "Lease Arrangement, Type [Domain]", "terseLabel": "Lease Arrangement, Type [Domain]" } } }, "localname": "LeaseArrangementTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LesseeLeaseDescriptionLineItems": { "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": "Lessee, Lease, Description [Line Items]", "terseLabel": "Lessee, Lease, Description [Line Items]" } } }, "localname": "LesseeLeaseDescriptionLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeLeaseDescriptionTable": { "auth_ref": [ "r200" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about lessee's leases.", "label": "Lessee, Lease, Description [Table]", "terseLabel": "Lessee, Lease, Description [Table]" } } }, "localname": "LesseeLeaseDescriptionTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeOperatingLeaseRenewalTerm": { "auth_ref": [ "r199" ], "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": "Renewal term (in months)" } } }, "localname": "LesseeOperatingLeaseRenewalTerm", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "durationItemType" }, "us-gaap_LesseeOperatingLeaseTermOfContract": { "auth_ref": [ "r199" ], "lang": { "en-US": { "role": { "documentation": "Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Lessee, Operating Lease, Term of Contract", "terseLabel": "Lease agreement, term (in months)" } } }, "localname": "LesseeOperatingLeaseTermOfContract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "xbrltype": "durationItemType" }, "us-gaap_Liabilities": { "auth_ref": [ "r31" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 1.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquity": { "auth_ref": [ "r22", "r234", "r243" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "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 Equity", "totalLabel": "Total liabilities and shareholders\u2019 equity" } } }, "localname": "LiabilitiesAndStockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Liabilities and Equity [Abstract]", "terseLabel": "Liabilities and Shareholders\u2019 Equity" } } }, "localname": "LiabilitiesAndStockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_LiabilitiesCurrent": { "auth_ref": [ "r33" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 1.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_LicensingAgreementsMember": { "auth_ref": [ "r156" ], "lang": { "en-US": { "role": { "documentation": "Rights, generally of limited duration, under a license arrangement (for example, to sell or otherwise utilize specified products or processes in a specified territory).", "label": "Licensing Agreements [Member]", "terseLabel": "License Agreement" } } }, "localname": "LicensingAgreementsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LineOfCreditMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars.", "label": "Line of Credit [Member]", "terseLabel": "Credit Agreement" } } }, "localname": "LineOfCreditMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MeasurementInputDiscountRateMember": { "auth_ref": [ "r173" ], "lang": { "en-US": { "role": { "documentation": "Measurement input using interest rate to determine present value of future cash flows.", "label": "Measurement Input, Discount Rate [Member]", "terseLabel": "Discount Rate" } } }, "localname": "MeasurementInputDiscountRateMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MeasurementInputExpectedDividendRateMember": { "auth_ref": [ "r173" ], "lang": { "en-US": { "role": { "documentation": "Measurement input using expected dividend rate to be paid to holder of share per year.", "label": "Measurement Input, Expected Dividend Rate [Member]", "terseLabel": "Expected Dividend Yield" } } }, "localname": "MeasurementInputExpectedDividendRateMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MeasurementInputTypeAxis": { "auth_ref": [ "r173" ], "lang": { "en-US": { "role": { "documentation": "Information by type of measurement input used to determine value of asset and liability.", "label": "Measurement Input Type [Axis]", "terseLabel": "Measurement Input Type [Axis]" } } }, "localname": "MeasurementInputTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_MeasurementInputTypeDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Measurement input used to determine value of asset and liability.", "label": "Measurement Input Type [Domain]", "terseLabel": "Measurement Input Type [Domain]" } } }, "localname": "MeasurementInputTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivities": { "auth_ref": [ "r62" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 3.0, "parentTag": "us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease", "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided by (Used in) Financing Activities [Abstract]", "terseLabel": "Cash flows from financing activities:" } } }, "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivities": { "auth_ref": [ "r62" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 2.0, "parentTag": "us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease", "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided by (Used in) Investing Activities [Abstract]", "terseLabel": "Cash flows from investing activities:" } } }, "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivities": { "auth_ref": [ "r62", "r64", "r67" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 1.0, "parentTag": "us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease", "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided by (Used in) Operating Activities [Abstract]", "terseLabel": "Cash flows from operating activities:" } } }, "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic": { "auth_ref": [ "r85", "r86" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.", "label": "Net Income (Loss) Available to Common Stockholders, Basic", "totalLabel": "Net loss attributable to common shareholders of Biohaven Pharmaceutical Holding Company Ltd." } } }, "localname": "NetIncomeLossAvailableToCommonStockholdersBasic", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss", "http://biohavenpharma.com/role/NetLossPerShareCalculationOfBasicAndDilutedNetLossPerShareDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]", "terseLabel": "Numerator:" } } }, "localname": "NetIncomeLossAvailableToCommonStockholdersDilutedAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareCalculationOfBasicAndDilutedNetLossPerShareDetails" ], "xbrltype": "stringItemType" }, "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 Adopted and Recently Issued Accounting Pronouncements" } } }, "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/SummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_NoncashInvestingAndFinancingItemsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Noncash Investing and Financing Items [Abstract]", "terseLabel": "Supplemental disclosure of non-cash investing and financing activities:" } } }, "localname": "NoncashInvestingAndFinancingItemsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_NonoperatingIncomeExpense": { "auth_ref": [ "r51" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 2.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).", "label": "Nonoperating Income (Expense)", "totalLabel": "Total other expense, net" } } }, "localname": "NonoperatingIncomeExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingExpenses": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 1.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "stringItemType" }, "us-gaap_OperatingIncomeLoss": { "auth_ref": [], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 1.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock": { "auth_ref": [ "r120", "r190", "r191", "r192", "r193" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions.", "label": "Lessee, Operating Lease, Disclosure [Table Text Block]", "terseLabel": "Schedule of lease arrangement for new headquarters" } } }, "localname": "OperatingLeasesOfLesseeDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesTables" ], "xbrltype": "textBlockItemType" }, "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/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock": { "auth_ref": [ "r0", "r167" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.", "label": "Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]", "terseLabel": "Nature of the Business and Basis of Presentation" } } }, "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentation" ], "xbrltype": "textBlockItemType" }, "us-gaap_OtherAccruedLiabilitiesCurrent": { "auth_ref": [ "r7", "r8", "r9", "r32" ], "calculation": { "http://biohavenpharma.com/role/AccruedExpensesDetails": { "order": 5.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/AccruedExpensesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherAssets": { "auth_ref": [ "r13", "r230", "r240" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 3.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherAssetsCurrent": { "auth_ref": [ "r41" ], "calculation": { "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails": { "order": 4.0, "parentTag": "us-gaap_PrepaidExpenseAndOtherAssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of current assets classified as other.", "label": "Other Assets, Current", "terseLabel": "Other" } } }, "localname": "OtherAssetsCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherIncomeAndExpensesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Income and Expenses [Abstract]", "terseLabel": "Other income (expense):" } } }, "localname": "OtherIncomeAndExpensesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "stringItemType" }, "us-gaap_OtherLiabilitiesNoncurrent": { "auth_ref": [ "r36" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 4.0, "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 long-term liabilities" } } }, "localname": "OtherLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherNoncashIncomeExpense": { "auth_ref": [ "r67" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 10.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.", "label": "Other Noncash Income (Expense)", "negatedTerseLabel": "Other non-cash items" } } }, "localname": "OtherNoncashIncomeExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherNonoperatingIncomeExpense": { "auth_ref": [ "r53" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 7.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "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" } } }, "localname": "OtherNonoperatingIncomeExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherPrepaidExpenseCurrent": { "auth_ref": [ "r2", "r5" ], "calculation": { "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails": { "order": 1.0, "parentTag": "us-gaap_PrepaidExpenseAndOtherAssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of asset related to consideration paid in advance for other costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.", "label": "Other Prepaid Expense, Current", "terseLabel": "Prepaid clinical trial costs" } } }, "localname": "OtherPrepaidExpenseCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OverAllotmentOptionMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Right given to the underwriter to sell additional shares over the initial allotment.", "label": "Over-Allotment Option [Member]", "terseLabel": "Over allotment option" } } }, "localname": "OverAllotmentOptionMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PayablesAndAccrualsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Payables and Accruals [Abstract]" } } }, "localname": "PayablesAndAccrualsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_PaymentsOfStockIssuanceCosts": { "auth_ref": [ "r59" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 7.0, "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": "Payments of issuance costs", "verboseLabel": "Other offering expenses" } } }, "localname": "PaymentsOfStockIssuanceCosts", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireEquityMethodInvestments": { "auth_ref": [ "r54" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 2.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.", "label": "Payments to Acquire Equity Method Investments", "negatedLabel": "Purchase of equity method investment", "terseLabel": "Cash payment for purchase of equity method investment", "verboseLabel": "Purchases of Kleo common stock" } } }, "localname": "PaymentsToAcquireEquityMethodInvestments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireIntangibleAssets": { "auth_ref": [ "r55" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.", "label": "Payments to Acquire Intangible Assets", "terseLabel": "Payment for license agreement" } } }, "localname": "PaymentsToAcquireIntangibleAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": { "auth_ref": [ "r55" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 1.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PrepaidExpenseAndOtherAssetsCurrent": { "auth_ref": [ "r4", "r23", "r24" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 2.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 }, "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "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", "totalLabel": "Total prepaid expenses and other current assets" } } }, "localname": "PrepaidExpenseAndOtherAssetsCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets", "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Prepaid Expense and Other Assets, Current [Abstract]" } } }, "localname": "PrepaidExpenseAndOtherAssetsCurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_PrepaidInsurance": { "auth_ref": [ "r3", "r5", "r109", "r110" ], "calculation": { "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails": { "order": 3.0, "parentTag": "us-gaap_PrepaidExpenseAndOtherAssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.", "label": "Prepaid Insurance", "terseLabel": "Prepaid insurance" } } }, "localname": "PrepaidInsurance", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PrivatePlacementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A private placement is a direct offering of securities to a limited number of sophisticated investors such as insurance companies, pension funds, mezzanine funds, stock funds and trusts.", "label": "Private Placement [Member]", "terseLabel": "Private Placement" } } }, "localname": "PrivatePlacementMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ProceedsFromIssuanceInitialPublicOffering": { "auth_ref": [ "r56" ], "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 issuance of common shares upon completion of initial public offering, net of underwriting commissions and discounts" } } }, "localname": "ProceedsFromIssuanceInitialPublicOffering", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfCommonStock": { "auth_ref": [ "r56" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 1.0, "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 issuance of common shares", "verboseLabel": "Proceeds from sale of common stock" } } }, "localname": "ProceedsFromIssuanceOfCommonStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock": { "auth_ref": [ "r56" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 4.0, "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 issuance of Series A preferred shares" } } }, "localname": "ProceedsFromIssuanceOfConvertiblePreferredStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfPrivatePlacement": { "auth_ref": [ "r56" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.", "label": "Proceeds from Issuance of Private Placement", "terseLabel": "Net proceeds from private placement stock issuance" } } }, "localname": "ProceedsFromIssuanceOfPrivatePlacement", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOrSaleOfEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Proceeds from Issuance or Sale of Equity [Abstract]", "terseLabel": "Public Offering" } } }, "localname": "ProceedsFromIssuanceOrSaleOfEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ProceedsFromNotesPayable": { "auth_ref": [ "r57" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from a borrowing supported by a written promise to pay an obligation.", "label": "Proceeds from Notes Payable", "terseLabel": "Amount borrowed" } } }, "localname": "ProceedsFromNotesPayable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromStockOptionsExercised": { "auth_ref": [ "r56", "r151" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 8.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.", "label": "Proceeds from Stock Options Exercised", "terseLabel": "Proceeds from exercise of stock options" } } }, "localname": "ProceedsFromStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProfitLoss": { "auth_ref": [ "r46", "r47", "r61", "r101", "r103", "r161", "r162", "r163", "r165", "r166" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 1.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 2.0, "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic", "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": "Net Income (Loss), Including Portion Attributable to Noncontrolling Interest", "negatedTerseLabel": "Net losses", "terseLabel": "Net loss", "totalLabel": "Net loss and comprehensive loss" } } }, "localname": "ProfitLoss", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails", "http://biohavenpharma.com/role/NetLossPerShareCalculationOfBasicAndDilutedNetLossPerShareDetails", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentNet": { "auth_ref": [ "r11", "r12", "r116", "r244" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 4.0, "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" } } }, "localname": "PropertyPlantAndEquipmentNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_RelatedPartyDomain": { "auth_ref": [ "r210" ], "lang": { "en-US": { "role": { "documentation": "Related parties include affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families. It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.", "label": "Related Party [Domain]", "terseLabel": "Related Party [Domain]" } } }, "localname": "RelatedPartyDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RelatedPartyTransactionAxis": { "auth_ref": [ "r144", "r204", "r206" ], "lang": { "en-US": { "role": { "documentation": "Information by type of related party transaction.", "label": "Related Party Transaction [Axis]", "terseLabel": "Related Party Transaction [Axis]" } } }, "localname": "RelatedPartyTransactionAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RelatedPartyTransactionDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Transaction between related party.", "label": "Related Party Transaction [Domain]", "terseLabel": "Related Party Transaction [Domain]" } } }, "localname": "RelatedPartyTransactionDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty": { "auth_ref": [ "r202" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.", "label": "Related Party Transaction, Expenses from Transactions with Related Party", "terseLabel": "Expenses under related party agreement" } } }, "localname": "RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RelatedPartyTransactionLineItems": { "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": "Related Party Transaction [Line Items]", "terseLabel": "Related Party Transactions" } } }, "localname": "RelatedPartyTransactionLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.", "label": "Related Party Transaction, Other Revenues from Transactions with Related Party", "terseLabel": "Payment received from related party" } } }, "localname": "RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RelatedPartyTransactionsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Related Party Transactions [Abstract]" } } }, "localname": "RelatedPartyTransactionsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_RelatedPartyTransactionsByRelatedPartyAxis": { "auth_ref": [ "r144", "r204", "r206", "r218", "r219", "r220", "r221", "r222", "r223", "r224", "r225", "r226", "r227", "r228", "r229" ], "lang": { "en-US": { "role": { "documentation": "Information by type of related party. Related parties include, but not limited to, affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families. It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.", "label": "Related Party [Axis]", "terseLabel": "Related Party [Axis]" } } }, "localname": "RelatedPartyTransactionsByRelatedPartyAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RelatedPartyTransactionsDisclosureTextBlock": { "auth_ref": [ "r210" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.", "label": "Related Party Transactions Disclosure [Text Block]", "terseLabel": "Related Party Transactions" } } }, "localname": "RelatedPartyTransactionsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactions" ], "xbrltype": "textBlockItemType" }, "us-gaap_RepaymentsOfNotesPayable": { "auth_ref": [ "r58" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 6.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow for a borrowing supported by a written promise to pay an obligation.", "label": "Repayments of Notes Payable", "negatedTerseLabel": "Repayment of notes payable", "terseLabel": "Principal repayment" } } }, "localname": "RepaymentsOfNotesPayable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows", "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RepaymentsOfRelatedPartyDebt": { "auth_ref": [ "r58" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 5.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates.", "label": "Repayments of Related Party Debt", "negatedTerseLabel": "Payments of related party notes payable" } } }, "localname": "RepaymentsOfRelatedPartyDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ResearchAndDevelopmentExpense": { "auth_ref": [ "r154", "r247" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss": { "order": 2.0, "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" ], "xbrltype": "monetaryItemType" }, "us-gaap_RetainedEarningsAccumulatedDeficit": { "auth_ref": [ "r21", "r138", "r242" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 3.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "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)", "negatedTerseLabel": "Accumulated deficit", "terseLabel": "Accumulated deficit" } } }, "localname": "RetainedEarningsAccumulatedDeficit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_SaleLeasebackTransactionNetBookValue": { "auth_ref": [ "r196", "r197", "r198", "r201" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller.", "label": "Sale Leaseback Transaction, Net Book Value", "terseLabel": "Value of property with option to purchase" } } }, "localname": "SaleLeasebackTransactionNetBookValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails" ], "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 [Domain]", "terseLabel": "Sale of Stock [Domain]" } } }, "localname": "SaleOfStockNameOfTransactionDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "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": "Common shares issued (shares)" } } }, "localname": "SaleOfStockNumberOfSharesIssuedInTransaction", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction.", "label": "Sale of Stock, Percentage of Ownership before Transaction", "terseLabel": "Percent of Company's outstanding equity fully diluted" } } }, "localname": "SaleOfStockPercentageOfOwnershipBeforeTransaction", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "percentItemType" }, "us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the components of accrued liabilities.", "label": "Schedule of Accrued Liabilities [Table Text Block]", "terseLabel": "Schedule of accrued expenses" } } }, "localname": "ScheduleOfAccruedLiabilitiesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/AccruedExpensesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable": { "auth_ref": [ "r88" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareAntidilutiveSecuritiesExcludedFromComputationOfNetLossPerShareDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock": { "auth_ref": [ "r88" ], "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 [Table Text Block]", "terseLabel": "Schedule of potentially anti-dilutive securities excluded from calculation of diluted net loss per share" } } }, "localname": "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable": { "auth_ref": [ "r157" ], "lang": { "en-US": { "role": { "documentation": "Schedule of contractual arrangements that involve two or more parties that both: (i) actively participate in a joint operating activity and (ii) are exposed to significant risks and rewards that depend on the commercial success of the joint operating activity. Additionally, the element may include all other transactions of the entity categorized collectively, if such comparison of collaborative arrangements as a component of all transactions of the entity is desired.", "label": "Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table]", "terseLabel": "Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table]" } } }, "localname": "ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfDebtTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.", "label": "Schedule of Debt [Table Text Block]", "terseLabel": "Schedule of activity within liability related to sale of future royalties" } } }, "localname": "ScheduleOfDebtTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": { "auth_ref": [ "r89" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.", "label": "Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]", "terseLabel": "Schedule of basic and diluted net loss per share" } } }, "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfEquityMethodInvestmentsLineItems": { "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": "Schedule of Equity Method Investments [Line Items]", "terseLabel": "Equity Method Investment", "verboseLabel": "Schedule of Equity Method Investments [Line Items]" } } }, "localname": "ScheduleOfEquityMethodInvestmentsLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentProportionateShareOfNetLossDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfEquityMethodInvestmentsTable": { "auth_ref": [ "r107" ], "lang": { "en-US": { "role": { "documentation": "Summarization of information required and determined to be disclosed concerning equity method investments in common stock. The summarized information includes: (a) the name of each investee or group of investees for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available.", "label": "Schedule of Equity Method Investments [Table]", "terseLabel": "Schedule of Equity Method Investments [Table]" } } }, "localname": "ScheduleOfEquityMethodInvestmentsTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/EquityMethodInvestmentCarryingValueDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentProportionateShareOfNetLossDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock": { "auth_ref": [ "r169" ], "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": "Summary of financial assets and liabilities measured at fair value on a recurring basis" } } }, "localname": "ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable": { "auth_ref": [ "r111", "r113" ], "lang": { "en-US": { "role": { "documentation": "Schedule of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.", "label": "Schedule of Finite-Lived Intangible Assets [Table]", "terseLabel": "Schedule of Finite-Lived Intangible Assets [Table]" } } }, "localname": "ScheduleOfFiniteLivedIntangibleAssetsTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable": { "auth_ref": [ "r76", "r204", "r206", "r207", "r208", "r209" ], "lang": { "en-US": { "role": { "documentation": "Schedule of quantitative and qualitative information pertaining to related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.", "label": "Schedule of Related Party Transactions, by Related Party [Table]", "terseLabel": "Schedule of Related Party Transactions, by Related Party [Table]" } } }, "localname": "ScheduleOfRelatedPartyTransactionsByRelatedPartyTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfRentExpenseTableTextBlock": { "auth_ref": [ "r192" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.", "label": "Schedule of Rent Expense [Table Text Block]", "terseLabel": "Schedule of rent expense" } } }, "localname": "ScheduleOfRentExpenseTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShortTermDebtTable": { "auth_ref": [ "r30" ], "lang": { "en-US": { "role": { "documentation": "A table or schedule providing information pertaining to borrowings under which repayment was required in less than twelve months (or normal operating cycle, if longer) after its issuance. It may include: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date and measures of the maximum and average amount outstanding during the period; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.", "label": "Schedule of Short-term Debt [Table]", "terseLabel": "Schedule of Short-term Debt [Table]" } } }, "localname": "ScheduleOfShortTermDebtTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfStockByClassTable": { "auth_ref": [ "r38", "r78", "r127", "r129", "r130", "r132", "r133", "r134", "r135", "r136", "r137", "r138" ], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfStockholdersEquityTableTextBlock": { "auth_ref": [ "r131" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented.", "label": "Schedule of Stockholders Equity [Table Text Block]", "terseLabel": "Schedule of changes in shareholders' equity" } } }, "localname": "ScheduleOfStockholdersEquityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ShareBasedCompensation": { "auth_ref": [ "r65" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows": { "order": 2.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.", "label": "Share-based Compensation", "terseLabel": "Share-based compensation expense" } } }, "localname": "ShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy": { "auth_ref": [ "r73", "r149", "r150" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.", "label": "Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]", "terseLabel": "Share-Based Compensation" } } }, "localname": "ShareBasedCompensationOptionAndIncentivePlansPolicy", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/SummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_SharePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Price of a single share of a number of saleable stocks of a company.", "label": "Share Price", "terseLabel": "Fair value of common share (in dollars per share)", "verboseLabel": "Issuance price per share (in dollars per share)" } } }, "localname": "SharePrice", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_SharesIssuedPricePerShare": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Per share or per unit amount of equity securities issued.", "label": "Shares Issued, Price Per Share", "terseLabel": "Common stock sold, price per share (in dollars per share)" } } }, "localname": "SharesIssuedPricePerShare", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_ShortTermDebtLineItems": { "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": "Short-term Debt [Line Items]", "terseLabel": "Short-term Debt [Line Items]" } } }, "localname": "ShortTermDebtLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShortTermDebtTypeAxis": { "auth_ref": [ "r30" ], "lang": { "en-US": { "role": { "documentation": "Information by type of short-term debt arrangement.", "label": "Short-term Debt, Type [Axis]", "terseLabel": "Short-term Debt, Type [Axis]" } } }, "localname": "ShortTermDebtTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShortTermDebtTypeDomain": { "auth_ref": [ "r28" ], "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 [Domain]" } } }, "localname": "ShortTermDebtTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails" ], "xbrltype": "domainItemType" }, "us-gaap_StatementClassOfStockAxis": { "auth_ref": [ "r17", "r18", "r19", "r131" ], "lang": { "en-US": { "role": { "documentation": "Information by the different classes of stock of the entity.", "label": "Class of Stock [Axis]", "terseLabel": "Class of Stock [Axis]" } } }, "localname": "StatementClassOfStockAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "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]", "verboseLabel": "Statement [Line Items]" } } }, "localname": "StatementLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails" ], "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/2018-01-31", "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/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities": { "auth_ref": [ "r39", "r131", "r132", "r138" ], "lang": { "en-US": { "role": { "documentation": "Number of shares issued during the period as a result of the conversion of convertible securities.", "label": "Stock Issued During Period, Shares, Conversion of Convertible Securities", "terseLabel": "Shares issued in connection with contingent equity liability (shares)", "verboseLabel": "Shares issued on conversion of preferred stock (shares)" } } }, "localname": "StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodSharesNewIssues": { "auth_ref": [ "r18", "r19", "r131", "r138" ], "lang": { "en-US": { "role": { "documentation": "Number of new stock issued during the period.", "label": "Stock Issued During Period, Shares, New Issues", "terseLabel": "Common stock sold (shares)", "verboseLabel": "Issuance of common shares (shares)" } } }, "localname": "StockIssuedDuringPeriodSharesNewIssues", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LiabilityRelatedToSaleOfFutureRoyaltiesNarrativeDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationGoingConcernDetails", "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination.", "label": "Stock Issued During Period, Shares, Purchase of Assets", "terseLabel": "Issuance of common shares as payment for license agreement (shares)" } } }, "localname": "StockIssuedDuringPeriodSharesPurchaseOfAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities": { "auth_ref": [ "r40", "r131", "r138" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The gross value of stock issued during the period upon the conversion of convertible securities.", "label": "Stock Issued During Period, Value, Conversion of Convertible Securities", "terseLabel": "Conversion of convertible preferred shares to common shares" } } }, "localname": "StockIssuedDuringPeriodValueConversionOfConvertibleSecurities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockIssuedDuringPeriodValueNewIssues": { "auth_ref": [ "r18", "r19", "r131", "r138" ], "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": "Issuance of common shares, net of offering costs" } } }, "localname": "StockIssuedDuringPeriodValueNewIssues", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination.", "label": "Stock Issued During Period, Value, Purchase of Assets", "terseLabel": "Issuance of common shares as payment for license agreement", "verboseLabel": "Issuance of common shares as payment for license agreement" } } }, "localname": "StockIssuedDuringPeriodValuePurchaseOfAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsLicenseAgreementWithAstrazenecaDetails", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised": { "auth_ref": [ "r40", "r131", "r138" ], "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": "Exercise of stock options" } } }, "localname": "StockIssuedDuringPeriodValueStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Stockholders' Equity Attributable to Parent [Abstract]", "terseLabel": "Shareholders\u2019 equity:" } } }, "localname": "StockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest": { "auth_ref": [ "r159", "r160", "r164" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 3.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.", "label": "Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest", "periodEndLabel": "Shareholders' equity, ending balance", "periodStartLabel": "Shareholders' equity, beginning balance", "totalLabel": "Total shareholders\u2019 equity" } } }, "localname": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquityNoteAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Stockholders' Equity Note [Abstract]" } } }, "localname": "StockholdersEquityNoteAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_StockholdersEquityNoteDisclosureTextBlock": { "auth_ref": [ "r141" ], "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": "Shareholders' Equity" } } }, "localname": "StockholdersEquityNoteDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquity" ], "xbrltype": "textBlockItemType" }, "us-gaap_SubsequentEventMember": { "auth_ref": [], "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/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SubsequentEventTypeAxis": { "auth_ref": [ "r211" ], "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 [Axis]" } } }, "localname": "SubsequentEventTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SubsequentEventTypeDomain": { "auth_ref": [ "r211" ], "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 [Domain]" } } }, "localname": "SubsequentEventTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CommitmentsAndContingenciesLeaseAgreementsAndLicenseAgreementsDetails", "http://biohavenpharma.com/role/EquityMethodInvestmentStockPurchaseAgreementWithKleoDetails", "http://biohavenpharma.com/role/RelatedPartyTransactionsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Different names of stock transactions and the different attributes of each transaction.", "label": "Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table]", "terseLabel": "Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table]" } } }, "localname": "SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SubsidiarySaleOfStockAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by type of sale of the entity's stock.", "label": "Sale of Stock [Axis]", "terseLabel": "Sale of Stock [Axis]" } } }, "localname": "SubsidiarySaleOfStockAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NatureOfBusinessAndBasisOfPresentationInitialPublicOfferingDetails", "http://biohavenpharma.com/role/ShareholdersEquityChangesInShareholdersEquityDetails", "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SubsidiarySaleOfStockLineItems": { "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": "Subsidiary, Sale of Stock [Line Items]", "terseLabel": "Common Shares [Line Items]" } } }, "localname": "SubsidiarySaleOfStockLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ShareholdersEquityNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SupplementalCashFlowInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Supplemental Cash Flow Information [Abstract]", "terseLabel": "Supplemental disclosure of cash flow information:" } } }, "localname": "SupplementalCashFlowInformationAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_TemporaryEquityByClassOfStockTable": { "auth_ref": [ "r10", "r128" ], "lang": { "en-US": { "role": { "documentation": "Table of capital stock that is classified as temporary 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. 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. This table may include a description by series, value, shares authorized, shares issued and outstanding, redemption price per share and subscription receivable.", "label": "Temporary Equity, by Class of Stock [Table]", "terseLabel": "Temporary Equity, by Class of Stock [Table]" } } }, "localname": "TemporaryEquityByClassOfStockTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_TemporaryEquityDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Temporary Equity Disclosure [Abstract]" } } }, "localname": "TemporaryEquityDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_TemporaryEquityLineItems": { "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": "Temporary Equity [Line Items]", "terseLabel": "Preferred Shares" } } }, "localname": "TemporaryEquityLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/ConvertiblePreferredSharesDetails" ], "xbrltype": "stringItemType" }, "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", "verboseLabel": "Aggregate fair value" } } }, "localname": "TemporaryEquityStockIssuedDuringPeriodValueNewIssues", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TitleOfIndividualAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by title of individual or nature of relationship to individual or group of individuals.", "label": "Title of Individual [Axis]", "terseLabel": "Title of Individual [Axis]" } } }, "localname": "TitleOfIndividualAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails", "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_TitleOfIndividualWithRelationshipToEntityDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Title of individual, or nature of relationship to individual or group of individuals.", "label": "Relationship to Entity [Domain]", "terseLabel": "Relationship to Entity [Domain]" } } }, "localname": "TitleOfIndividualWithRelationshipToEntityDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/WarrantsCreditAgreementDetails", "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain": { "auth_ref": [ "r216" ], "lang": { "en-US": { "role": { "documentation": "Instrument or contract that imposes a contractual obligation to deliver cash or another financial instrument or to exchange other financial instruments on potentially unfavorable terms and conveys a contractual right to receive cash or another financial instrument or to exchange other financial instruments on potentially favorable terms.", "label": "Financial Instruments [Domain]", "terseLabel": "Financial Instruments [Domain]" } } }, "localname": "TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TypeOfArrangementAxis": { "auth_ref": [ "r157" ], "lang": { "en-US": { "role": { "documentation": "Information by category of arrangement, including but not limited to collaborative arrangements and non-collaborative arrangements.", "label": "Type of Arrangement and Non-arrangement Transactions [Axis]", "terseLabel": "Type of Arrangement and Non-arrangement Transactions [Axis]" } } }, "localname": "TypeOfArrangementAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/LicenseAndOtherAgreementsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_UseOfEstimates": { "auth_ref": [ "r91", "r92", "r93", "r94", "r95", "r96", "r97" ], "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, Policy [Policy Text Block]", "terseLabel": "Use of Estimates" } } }, "localname": "UseOfEstimates", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/SummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_WarrantMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Security that gives the holder the right to purchase shares of stock in accordance with the terms of the instrument, usually upon payment of a specified amount.", "label": "Warrant [Member]", "terseLabel": "Warrant Liability", "verboseLabel": "Warrants to purchase common shares" } } }, "localname": "WarrantMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails", "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesRollforwardOfLiabilitiesMeasuredByLevel3InputsDetails", "http://biohavenpharma.com/role/NetLossPerShareAntidilutiveSecuritiesExcludedFromComputationOfNetLossPerShareDetails" ], "xbrltype": "domainItemType" }, "us-gaap_WarrantsAndRightsOutstanding": { "auth_ref": [ "r82" ], "calculation": { "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets": { "order": 3.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.", "label": "Warrants and Rights Outstanding", "terseLabel": "Warrant liability", "verboseLabel": "Fair value of warrant liability" } } }, "localname": "WarrantsAndRightsOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedBalanceSheets", "http://biohavenpharma.com/role/WarrantsGuarantorAndCoGuarantorWarrantsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_WarrantsAndRightsOutstandingMeasurementInput": { "auth_ref": [ "r174" ], "lang": { "en-US": { "role": { "documentation": "Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.", "label": "Warrants and Rights Outstanding, Measurement Input", "terseLabel": "Measurement input for warrant liability" } } }, "localname": "WarrantsAndRightsOutstandingMeasurementInput", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" ], "xbrltype": "decimalItemType" }, "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 Shares Outstanding, Basic and Diluted", "terseLabel": "Weighted average common shares outstanding - basic and diluted (shares)" } } }, "localname": "WeightedAverageNumberOfShareOutstandingBasicAndDiluted", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss", "http://biohavenpharma.com/role/NetLossPerShareCalculationOfBasicAndDilutedNetLossPerShareDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Weighted Average Number of Shares Outstanding Reconciliation [Abstract]", "terseLabel": "Denominator:" } } }, "localname": "WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://biohavenpharma.com/role/NetLossPerShareCalculationOfBasicAndDilutedNetLossPerShareDetails" ], "xbrltype": "stringItemType" } }, "unitCount": 7 } }, "std_ref": { "r0": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "205", "URI": "http://asc.fasb.org/topic&trid=2122149" }, "r1": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765" }, "r10": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(27)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r100": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r101": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r102": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599" }, "r103": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599" }, "r104": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "25", "SubTopic": "10", "Topic": "323", "URI": "http://asc.fasb.org/extlink&oid=66022186&loc=d3e32014-111567" }, "r105": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "323", "URI": "http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570" }, "r106": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "323", "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571" }, "r107": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(b)", "Topic": "323", "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571" }, "r108": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "323", "URI": "http://asc.fasb.org/topic&trid=2196965" }, "r109": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "05", "SubTopic": "10", "Topic": "340", "URI": "http://asc.fasb.org/extlink&oid=68074540&loc=d3e5865-108316" }, "r11": { "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=6877327&loc=d3e13212-122682" }, "r110": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "05", "SubTopic": "10", "Topic": "340", "URI": "http://asc.fasb.org/extlink&oid=68074540&loc=d3e5879-108316" }, "r111": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r112": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r113": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r114": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(1)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r115": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r116": { "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" }, "r117": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "440", "URI": "http://asc.fasb.org/topic&trid=2144648" }, "r118": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "450", "URI": "http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349" }, "r119": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "450", "URI": "http://asc.fasb.org/topic&trid=2127136" }, "r12": { "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=6877327&loc=d3e13212-122682" }, "r120": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "460", "URI": "http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248" }, "r121": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601" }, "r122": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "25", "SubTopic": "20", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=109126253&loc=d3e4724-112606" }, "r123": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870" }, "r124": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870" }, "r125": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "470", "URI": "http://asc.fasb.org/topic&trid=2208564" }, "r126": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "25", "SubTopic": "10", "Topic": "480", "URI": "http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875" }, "r127": { "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=65877616&loc=d3e177068-122764" }, "r128": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Topic": "480", "URI": "http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764" }, "r129": { "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" }, "r13": { "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=6877327&loc=d3e13212-122682" }, "r130": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21553-112644" }, "r131": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644" }, "r132": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644" }, "r133": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644" }, "r134": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644" }, "r135": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644" }, "r136": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644" }, "r137": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644" }, "r138": { "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=27012166&loc=d3e187085-122770" }, "r139": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "50", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666" }, "r14": { "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=6877327&loc=d3e13212-122682" }, "r140": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "50", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775" }, "r141": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "505", "URI": "http://asc.fasb.org/topic&trid=2208762" }, "r142": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(ii)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r143": { "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=108410482&loc=d3e1928-114920" }, "r144": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(n)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r145": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921" }, "r146": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "35", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=79507207&loc=d3e4534-113899" }, "r147": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901" }, "r148": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901" }, "r149": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901" }, "r15": { "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=6877327&loc=d3e13212-122682" }, "r150": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b),(f)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r151": { "Name": "Accounting Standards Codification", "Paragraph": "2A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901" }, "r152": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109196918&loc=d3e11149-113907" }, "r153": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109196918&loc=d3e11178-113907" }, "r154": { "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" }, "r155": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324" }, "r156": { "Name": "Accounting Standards Codification", "Paragraph": "31", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5419-128473" }, "r157": { "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" }, "r158": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "808", "URI": "http://asc.fasb.org/topic&trid=5833765" }, "r159": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683" }, "r16": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(22))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r160": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683" }, "r161": { "Name": "Accounting Standards Codification", "Paragraph": "19", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683" }, "r162": { "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" }, "r163": { "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" }, "r164": { "Name": "Accounting Standards Codification", "Paragraph": "4I", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686" }, "r165": { "Name": "Accounting Standards Codification", "Paragraph": "4J", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686" }, "r166": { "Name": "Accounting Standards Codification", "Paragraph": "4K", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686" }, "r167": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "810", "URI": "http://asc.fasb.org/topic&trid=2197479" }, "r168": { "Name": "Accounting Standards Codification", "Paragraph": "83", "Publisher": "FASB", "Section": "15", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109257184&loc=d3e34841-113949" }, "r169": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258" }, "r17": { "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=6877327&loc=d3e13212-122682" }, "r170": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r171": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r172": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bb)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r173": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bbb)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r174": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bbb)(2)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r175": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r176": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r177": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r178": { "Name": "Accounting Standards Codification", "Paragraph": "2C", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=SL7498348-110258" }, "r179": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258" }, "r18": { "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=6877327&loc=d3e13212-122682" }, "r180": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "820", "URI": "http://asc.fasb.org/topic&trid=2155941" }, "r181": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611" }, "r182": { "Name": "Accounting Standards Codification", "Paragraph": "30", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612" }, "r183": { "Name": "Accounting Standards Codification", "Paragraph": "31", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=75031198&loc=d3e14210-108612" }, "r184": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=75031198&loc=d3e14217-108612" }, "r185": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391" }, "r186": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399" }, "r187": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399" }, "r188": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399" }, "r189": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "55", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400" }, "r19": { "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=6877327&loc=d3e13212-122682" }, "r190": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694" }, "r191": { "Name": "Accounting Standards Codification", "Paragraph": "40", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Subparagraph": "(Note 1,3)", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697" }, "r192": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717" }, "r193": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717" }, "r194": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735" }, "r195": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737" }, "r196": { "Name": "Accounting Standards Codification", "Paragraph": "50", "Publisher": "FASB", "Section": "55", "SubTopic": "40", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=82846721&loc=d3e51831-112757" }, "r197": { "Name": "Accounting Standards Codification", "Paragraph": "51", "Publisher": "FASB", "Section": "55", "SubTopic": "40", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=82846721&loc=d3e51840-112757" }, "r198": { "Name": "Accounting Standards Codification", "Paragraph": "52", "Publisher": "FASB", "Section": "55", "SubTopic": "40", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=82846721&loc=d3e51843-112757" }, "r199": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(3)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980" }, "r2": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(g)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765" }, "r20": { "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=6877327&loc=d3e13212-122682" }, "r200": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980" }, "r201": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "40", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888430&loc=SL77919786-209982" }, "r202": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864" }, "r203": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864" }, "r204": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864" }, "r205": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864" }, "r206": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864" }, "r207": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864" }, "r208": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864" }, "r209": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864" }, "r21": { "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=6877327&loc=d3e13212-122682" }, "r210": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "850", "URI": "http://asc.fasb.org/topic&trid=2122745" }, "r211": { "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" }, "r212": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719" }, "r213": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(1)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719" }, "r214": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(2)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719" }, "r215": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(3)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719" }, "r216": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "50", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746" }, "r217": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "340", "Topic": "928", "URI": "http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004" }, "r218": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(a)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447" }, "r219": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(b)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447" }, "r22": { "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=6877327&loc=d3e13212-122682" }, "r220": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(a)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447" }, "r221": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(b)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447" }, "r222": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(a)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447" }, "r223": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(b)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447" }, "r224": { "Name": "Accounting Standards Codification", "Paragraph": "33", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(a)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447" }, "r225": { "Name": "Accounting Standards Codification", "Paragraph": "33", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(b)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447" }, "r226": { "Name": "Accounting Standards Codification", "Paragraph": "35A", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(a)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447" }, "r227": { "Name": "Accounting Standards Codification", "Paragraph": "35A", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(b)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447" }, "r228": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(c)(1)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447" }, "r229": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "235", "Subparagraph": "(c)(2)", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447" }, "r23": { "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=6877327&loc=d3e13212-122682" }, "r230": { "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=6876686&loc=d3e534808-122878" }, "r231": { "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=6876686&loc=d3e534808-122878" }, "r232": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(13))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r233": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(16))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r234": { "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=6876686&loc=d3e534808-122878" }, "r235": { "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=6876686&loc=d3e534808-122878" }, "r236": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(13)(f))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260" }, "r237": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.9)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260" }, "r238": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823" }, "r239": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(16))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r24": { "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=6877327&loc=d3e13212-122682" }, "r240": { "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=6879938&loc=d3e572229-122910" }, "r241": { "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=6879938&loc=d3e572229-122910" }, "r242": { "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=6879938&loc=d3e572229-122910" }, "r243": { "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=6879938&loc=d3e572229-122910" }, "r244": { "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=6879938&loc=d3e572229-122910" }, "r245": { "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=6879938&loc=d3e572229-122910" }, "r246": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(10))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263" }, "r247": { "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" }, "r248": { "Name": "Regulation 12B", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b-2" }, "r249": { "Name": "Securities Act", "Number": "7A", "Publisher": "SEC", "Section": "B", "Subsection": "2" }, "r25": { "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=6877327&loc=d3e13212-122682" }, "r26": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.12)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r27": { "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=6877327&loc=d3e13212-122682" }, "r28": { "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=6877327&loc=d3e13212-122682" }, "r29": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19(a),20,24)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r3": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(g)(1)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765" }, "r30": { "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=6877327&loc=d3e13212-122682" }, "r31": { "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=6877327&loc=d3e13212-122682" }, "r32": { "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=6877327&loc=d3e13212-122682" }, "r33": { "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=6877327&loc=d3e13212-122682" }, "r34": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.22(a)(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r35": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.22)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r36": { "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=6877327&loc=d3e13212-122682" }, "r37": { "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=6877327&loc=d3e13212-122682" }, "r38": { "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=6877327&loc=d3e13212-122682" }, "r39": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.29-30)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r4": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765" }, "r40": { "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=6877327&loc=d3e13212-122682" }, "r41": { "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=6877327&loc=d3e13212-122682" }, "r42": { "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=6877327&loc=d3e13212-122682" }, "r43": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312" }, "r44": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313" }, "r45": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226024-175313" }, "r46": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580" }, "r47": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580" }, "r48": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(210.5-03(11))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r49": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(12))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r5": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6787-107765" }, "r50": { "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=115205541&loc=SL114868664-224227" }, "r51": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.7)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r52": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.8)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r53": { "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=115205541&loc=SL114868664-224227" }, "r54": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585" }, "r55": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585" }, "r56": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585" }, "r57": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585" }, "r58": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585" }, "r59": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585" }, "r6": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6801-107765" }, "r60": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585" }, "r61": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3000-108585" }, "r62": { "Name": "Accounting Standards Codification", "Paragraph": "24", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585" }, "r63": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585" }, "r64": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585" }, "r65": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585" }, "r66": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585" }, "r67": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585" }, "r68": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585" }, "r69": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586" }, "r7": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765" }, "r70": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586" }, "r71": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586" }, "r72": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586" }, "r73": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790" }, "r74": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(h))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r75": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(i))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r76": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(k))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r77": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(m)(1)(iii))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r78": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(d),(e))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r79": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(e),(f))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r8": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765" }, "r80": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(h)(1)(i))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r81": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(i)(4))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r82": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(i))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r83": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(k)(1))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r84": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "235", "URI": "http://asc.fasb.org/topic&trid=2122369" }, "r85": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794" }, "r86": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=d3e1377-109256" }, "r87": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256" }, "r88": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r89": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r9": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e7018-107765" }, "r90": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "260", "URI": "http://asc.fasb.org/topic&trid=2144383" }, "r91": { "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" }, "r92": { "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" }, "r93": { "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" }, "r94": { "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" }, "r95": { "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" }, "r96": { "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" }, "r97": { "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" }, "r98": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r99": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(g)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" } }, "version": "2.0" }