3.10.0.1 html 137 257 1 false 55 0 false 6 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.histogenics.com/20180930/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Consolidated Balance Sheets Sheet http://www.histogenics.com/20180930/taxonomy/role/StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 100020 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.histogenics.com/20180930/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Consolidated Statements of Operations Sheet http://www.histogenics.com/20180930/taxonomy/role/StatementConsolidatedStatementsOfOperations Consolidated Statements of Operations Statements 4 false false R5.htm 100040 - Statement - Consolidated Statements of Cash Flows Sheet http://www.histogenics.com/20180930/taxonomy/role/StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 5 false false R6.htm 100050 - Disclosure - Nature of Business Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureNatureOfBusiness Nature of Business Notes 6 false false R7.htm 100060 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 7 false false R8.htm 100070 - Disclosure - Loss Per Common Share Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureLossPerCommonShare Loss Per Common Share Notes 8 false false R9.htm 100080 - Disclosure - Property and Equipment Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosurePropertyAndEquipment Property and Equipment Notes 9 false false R10.htm 100090 - Disclosure - Commitments and Contingencies Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 10 false false R11.htm 100100 - Disclosure - Capital Stock Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureCapitalStock Capital Stock Notes 11 false false R12.htm 100110 - Disclosure - Warrants Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureWarrants Warrants Notes 12 false false R13.htm 100120 - Disclosure - Stock-Based Compensation Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureStockBasedCompensation Stock-Based Compensation Notes 13 false false R14.htm 100130 - Disclosure - Income Taxes Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureIncomeTaxes Income Taxes Notes 14 false false R15.htm 100140 - Disclosure - Equipment Loan Payable Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureEquipmentLoanPayable Equipment Loan Payable Notes 15 false false R16.htm 100150 - Disclosure - Related Parties Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureRelatedParties Related Parties Notes 16 false false R17.htm 100160 - Disclosure - Subsequent Events Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureSubsequentEvents Subsequent Events Notes 17 false false R18.htm 100170 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.histogenics.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 18 false false R19.htm 100180 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.histogenics.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 19 false false R20.htm 100190 - Disclosure - Loss Per Common Share (Tables) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureLossPerCommonShareTables Loss Per Common Share (Tables) Tables http://www.histogenics.com/20180930/taxonomy/role/DisclosureLossPerCommonShare 20 false false R21.htm 100200 - Disclosure - Property and Equipment (Tables) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosurePropertyAndEquipmentTables Property and Equipment (Tables) Tables http://www.histogenics.com/20180930/taxonomy/role/DisclosurePropertyAndEquipment 21 false false R22.htm 100210 - Disclosure - Warrants (Tables) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureWarrantsTables Warrants (Tables) Tables http://www.histogenics.com/20180930/taxonomy/role/DisclosureWarrants 22 false false R23.htm 100220 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.histogenics.com/20180930/taxonomy/role/DisclosureStockBasedCompensation 23 false false R24.htm 100230 - Disclosure - Equipment Loan Payable (Tables) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureEquipmentLoanPayableTables Equipment Loan Payable (Tables) Tables http://www.histogenics.com/20180930/taxonomy/role/DisclosureEquipmentLoanPayable 24 false false R25.htm 100240 - Disclosure - Nature of Business - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureNatureOfBusinessAdditionalInformationDetail Nature of Business - Additional Information (Detail) Details 25 false false R26.htm 100250 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail Summary of Significant Accounting Policies - Additional Information (Detail) Details 26 false false R27.htm 100260 - Disclosure - Summary of Significant Accounting Policies - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail Summary of Significant Accounting Policies - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Details 27 false false R28.htm 100270 - Disclosure - Summary of Significant Accounting Policies - Schedule of Reconciliation of Liabilities Measured at Fair Value (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfReconciliationOfLiabilitiesMeasuredAtFairValueDetail Summary of Significant Accounting Policies - Schedule of Reconciliation of Liabilities Measured at Fair Value (Detail) Details 28 false false R29.htm 100280 - Disclosure - Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfReconciliationOfCashCashEquivalentsAndRestrictedCashDetail Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail) Details 29 false false R30.htm 100290 - Disclosure - Loss Per Common Share - Schedule of Basic and Diluted Loss Per Common Share (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureLossPerCommonShareScheduleOfBasicAndDilutedLossPerCommonShareDetail Loss Per Common Share - Schedule of Basic and Diluted Loss Per Common Share (Detail) Details 30 false false R31.htm 100300 - Disclosure - Loss Per Common Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureLossPerCommonShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail Loss Per Common Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) Details 31 false false R32.htm 100310 - Disclosure - Property and Equipment - Schedule of Property and Equipment (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetail Property and Equipment - Schedule of Property and Equipment (Detail) Details 32 false false R33.htm 100320 - Disclosure - Property and Equipment - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosurePropertyAndEquipmentAdditionalInformationDetail Property and Equipment - Additional Information (Detail) Details 33 false false R34.htm 100330 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 34 false false R35.htm 100340 - Disclosure - Capital Stock - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureCapitalStockAdditionalInformationDetail Capital Stock - Additional Information (Detail) Details 35 false false R36.htm 100350 - Disclosure - Warrants - Schedule of Warrants to Purchase Common Stock Outstanding (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureWarrantsScheduleOfWarrantsToPurchaseCommonStockOutstandingDetail Warrants - Schedule of Warrants to Purchase Common Stock Outstanding (Detail) Details 36 false false R37.htm 100360 - Disclosure - Stock-Based Compensation - Summary of Stock Option Activity Under the 2012 and 2013 Plans (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivityUnder2012And2013PlansDetail Stock-Based Compensation - Summary of Stock Option Activity Under the 2012 and 2013 Plans (Detail) Details 37 false false R38.htm 100370 - Disclosure - Stock-Based Compensation - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail Stock-Based Compensation - Additional Information (Detail) Details 38 false false R39.htm 100380 - Disclosure - Stock-Based Compensation - Summary of Stock-Based Compensation for all Options Granted and Restricted Stock Awards (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockBasedCompensationForAllOptionsGrantedAndRestrictedStockAwardsDetail Stock-Based Compensation - Summary of Stock-Based Compensation for all Options Granted and Restricted Stock Awards (Detail) Details 39 false false R40.htm 100390 - Disclosure - Stock-Based Compensation - Summary of Weighted-Average Assumptions Used in the Black-Scholes Option Pricing Model to Determine the Fair Value of the Employee Stock Option Grants (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureStockBasedCompensationSummaryOfWeightedAverageAssumptionsUsedInBlackScholesOptionPricingModelToDetermineFairValueOfEmployeeStockOptionGrantsDetail Stock-Based Compensation - Summary of Weighted-Average Assumptions Used in the Black-Scholes Option Pricing Model to Determine the Fair Value of the Employee Stock Option Grants (Detail) Details 40 false false R41.htm 100400 - Disclosure - Stock-Based Compensation - Summary of Weighted-Average Assumptions Used in the Black-Scholes Option Pricing Model to Determine the Fair Value of the Non-Employee Stock Option Grants (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureStockBasedCompensationSummaryOfWeightedAverageAssumptionsUsedInBlackScholesOptionPricingModelToDetermineFairValueOfNonEmployeeStockOptionGrantsDetail Stock-Based Compensation - Summary of Weighted-Average Assumptions Used in the Black-Scholes Option Pricing Model to Determine the Fair Value of the Non-Employee Stock Option Grants (Detail) Details 41 false false R42.htm 100410 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 42 false false R43.htm 100420 - Disclosure - Equipment Loan Payable - Schedule of Outstanding Borrowing Obligations (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureEquipmentLoanPayableScheduleOfOutstandingBorrowingObligationsDetail Equipment Loan Payable - Schedule of Outstanding Borrowing Obligations (Detail) Details 43 false false R44.htm 100430 - Disclosure - Equipment Loan Payable - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureEquipmentLoanPayableAdditionalInformationDetail Equipment Loan Payable - Additional Information (Detail) Details 44 false false R45.htm 100440 - Disclosure - Related Parties - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureRelatedPartiesAdditionalInformationDetail Related Parties - Additional Information (Detail) Details 45 false false R46.htm 100450 - Disclosure - Subsequent Events - Additional Information (Detail) Sheet http://www.histogenics.com/20180930/taxonomy/role/DisclosureSubsequentEventsAdditionalInformationDetail Subsequent Events - Additional Information (Detail) Details 46 false false All Reports Book All Reports hsgx-20180930.xml hsgx-20180930.xsd hsgx-20180930_cal.xml hsgx-20180930_def.xml hsgx-20180930_lab.xml hsgx-20180930_pre.xml http://fasb.org/us-gaap/2018-01-31 http://xbrl.sec.gov/dei/2018-01-31 http://xbrl.sec.gov/stpr/2018-01-31 http://fasb.org/srt/2018-01-31 true true