3.20.1 html 127 273 1 false 35 0 false 8 false false R1.htm 0001001 - Document - Cover Page Sheet http://www.dicerna.com/role/CoverPage Cover Page Cover 1 false false R2.htm 1001002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) Sheet http://www.dicerna.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUnaudited CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) Statements 2 false false R3.htm 1002003 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) Sheet http://www.dicerna.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUnauditedParenthetical CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) Statements 3 false false R4.htm 1003004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) Sheet http://www.dicerna.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUnaudited CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) Statements 4 false false R5.htm 1004005 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) Sheet http://www.dicerna.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITYUnaudited CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) Statements 5 false false R6.htm 1005006 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) Sheet http://www.dicerna.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITYUnauditedParenthetical CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) Statements 6 false false R7.htm 1006007 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) Sheet http://www.dicerna.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) Statements 7 false false R8.htm 2101101 - Disclosure - DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Sheet http://www.dicerna.com/role/DESCRIPTIONOFBUSINESSANDBASISOFPRESENTATION DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Notes 8 false false R9.htm 2104102 - Disclosure - NET LOSS PER SHARE Sheet http://www.dicerna.com/role/NETLOSSPERSHARE NET LOSS PER SHARE Notes 9 false false R10.htm 2108103 - Disclosure - HELD-TO-MATURITY INVESTMENTS Sheet http://www.dicerna.com/role/HELDTOMATURITYINVESTMENTS HELD-TO-MATURITY INVESTMENTS Notes 10 false false R11.htm 2111104 - Disclosure - FAIR VALUE MEASUREMENTS Sheet http://www.dicerna.com/role/FAIRVALUEMEASUREMENTS FAIR VALUE MEASUREMENTS Notes 11 false false R12.htm 2114105 - Disclosure - COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS Sheet http://www.dicerna.com/role/COLLABORATIVERESEARCHANDLICENSEAGREEMENTS COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS Notes 12 false false R13.htm 2122106 - Disclosure - STOCK-BASED COMPENSATION Sheet http://www.dicerna.com/role/STOCKBASEDCOMPENSATION STOCK-BASED COMPENSATION Notes 13 false false R14.htm 2127107 - Disclosure - LEASES Sheet http://www.dicerna.com/role/LEASES LEASES Notes 14 false false R15.htm 2129108 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.dicerna.com/role/COMMITMENTSANDCONTINGENCIES COMMITMENTS AND CONTINGENCIES Notes 15 false false R16.htm 2131109 - Disclosure - SUBSEQUENT EVENT Sheet http://www.dicerna.com/role/SUBSEQUENTEVENT SUBSEQUENT EVENT Notes 16 false false R17.htm 2202201 - Disclosure - DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Policies) Sheet http://www.dicerna.com/role/DESCRIPTIONOFBUSINESSANDBASISOFPRESENTATIONPolicies DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Policies) Policies 17 false false R18.htm 2305301 - Disclosure - NET LOSS PER SHARE (Tables) Sheet http://www.dicerna.com/role/NETLOSSPERSHARETables NET LOSS PER SHARE (Tables) Tables http://www.dicerna.com/role/NETLOSSPERSHARE 18 false false R19.htm 2309302 - Disclosure - HELD-TO-MATURITY INVESTMENTS (Tables) Sheet http://www.dicerna.com/role/HELDTOMATURITYINVESTMENTSTables HELD-TO-MATURITY INVESTMENTS (Tables) Tables http://www.dicerna.com/role/HELDTOMATURITYINVESTMENTS 19 false false R20.htm 2312303 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) Sheet http://www.dicerna.com/role/FAIRVALUEMEASUREMENTSTables FAIR VALUE MEASUREMENTS (Tables) Tables http://www.dicerna.com/role/FAIRVALUEMEASUREMENTS 20 false false R21.htm 2315304 - Disclosure - COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS (Tables) Sheet http://www.dicerna.com/role/COLLABORATIVERESEARCHANDLICENSEAGREEMENTSTables COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS (Tables) Tables http://www.dicerna.com/role/COLLABORATIVERESEARCHANDLICENSEAGREEMENTS 21 false false R22.htm 2323305 - Disclosure - STOCK-BASED COMPENSATION (Tables) Sheet http://www.dicerna.com/role/STOCKBASEDCOMPENSATIONTables STOCK-BASED COMPENSATION (Tables) Tables http://www.dicerna.com/role/STOCKBASEDCOMPENSATION 22 false false R23.htm 2403401 - Disclosure - DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details) Sheet http://www.dicerna.com/role/DESCRIPTIONOFBUSINESSANDBASISOFPRESENTATIONDetails DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details) Details http://www.dicerna.com/role/DESCRIPTIONOFBUSINESSANDBASISOFPRESENTATIONPolicies 23 false false R24.htm 2406402 - Disclosure - NET LOSS PER SHARE - Additional Information (Details) Sheet http://www.dicerna.com/role/NETLOSSPERSHAREAdditionalInformationDetails NET LOSS PER SHARE - Additional Information (Details) Details 24 false false R25.htm 2407403 - Disclosure - NET LOSS PER SHARE - Outstanding Securities excluded from Calculation of Net Loss Per Share (Details) Sheet http://www.dicerna.com/role/NETLOSSPERSHAREOutstandingSecuritiesexcludedfromCalculationofNetLossPerShareDetails NET LOSS PER SHARE - Outstanding Securities excluded from Calculation of Net Loss Per Share (Details) Details 25 false false R26.htm 2410404 - Disclosure - HELD-TO-MATURITY INVESTMENTS - Schedule of Held-To-Maturity Investments (Details) Sheet http://www.dicerna.com/role/HELDTOMATURITYINVESTMENTSScheduleofHeldToMaturityInvestmentsDetails HELD-TO-MATURITY INVESTMENTS - Schedule of Held-To-Maturity Investments (Details) Details 26 false false R27.htm 2413405 - Disclosure - FAIR VALUE MEASUREMENTS (Details) Sheet http://www.dicerna.com/role/FAIRVALUEMEASUREMENTSDetails FAIR VALUE MEASUREMENTS (Details) Details http://www.dicerna.com/role/FAIRVALUEMEASUREMENTSTables 27 false false R28.htm 2416406 - Disclosure - COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Novo Collaboration Agreement and Novo Share Issuance Agreement (Details) Sheet http://www.dicerna.com/role/COLLABORATIVERESEARCHANDLICENSEAGREEMENTSNovoCollaborationAgreementandNovoShareIssuanceAgreementDetails COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Novo Collaboration Agreement and Novo Share Issuance Agreement (Details) Details 28 false false R29.htm 2417407 - Disclosure - COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Roche Collaboration Agreement (Details) Sheet http://www.dicerna.com/role/COLLABORATIVERESEARCHANDLICENSEAGREEMENTSRocheCollaborationAgreementDetails COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Roche Collaboration Agreement (Details) Details 29 false false R30.htm 2418408 - Disclosure - COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Lilly Collaboration and Share Purchase Agreements (Details) Sheet http://www.dicerna.com/role/COLLABORATIVERESEARCHANDLICENSEAGREEMENTSLillyCollaborationandSharePurchaseAgreementsDetails COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Lilly Collaboration and Share Purchase Agreements (Details) Details 30 false false R31.htm 2419409 - Disclosure - COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Alexion Collaboration and Equity Agreements (Details) Sheet http://www.dicerna.com/role/COLLABORATIVERESEARCHANDLICENSEAGREEMENTSAlexionCollaborationandEquityAgreementsDetails COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Alexion Collaboration and Equity Agreements (Details) Details 31 false false R32.htm 2420410 - Disclosure - COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - BI Agreement and Related Amendments (Details) Sheet http://www.dicerna.com/role/COLLABORATIVERESEARCHANDLICENSEAGREEMENTSBIAgreementandRelatedAmendmentsDetails COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - BI Agreement and Related Amendments (Details) Details 32 false false R33.htm 2421411 - Disclosure - COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Changes in Deferred Revenue (Details) Sheet http://www.dicerna.com/role/COLLABORATIVERESEARCHANDLICENSEAGREEMENTSChangesinDeferredRevenueDetails COLLABORATIVE RESEARCH AND LICENSE AGREEMENTS - Changes in Deferred Revenue (Details) Details 33 false false R34.htm 2424412 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details) Sheet http://www.dicerna.com/role/STOCKBASEDCOMPENSATIONNarrativeDetails STOCK-BASED COMPENSATION - Narrative (Details) Details 34 false false R35.htm 2425413 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Valuation Assumptions (Details) Sheet http://www.dicerna.com/role/STOCKBASEDCOMPENSATIONScheduleofValuationAssumptionsDetails STOCK-BASED COMPENSATION - Schedule of Valuation Assumptions (Details) Details 35 false false R36.htm 2426414 - Disclosure - STOCK-BASED COMPENSATION - Classification of Stock-Based Compensation Expense (Details) Sheet http://www.dicerna.com/role/STOCKBASEDCOMPENSATIONClassificationofStockBasedCompensationExpenseDetails STOCK-BASED COMPENSATION - Classification of Stock-Based Compensation Expense (Details) Details 36 false false R37.htm 2428415 - Disclosure - LEASES - Narrative (Details) Sheet http://www.dicerna.com/role/LEASESNarrativeDetails LEASES - Narrative (Details) Details 37 false false R38.htm 2430416 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://www.dicerna.com/role/COMMITMENTSANDCONTINGENCIESDetails COMMITMENTS AND CONTINGENCIES (Details) Details http://www.dicerna.com/role/COMMITMENTSANDCONTINGENCIES 38 false false R39.htm 2432417 - Disclosure - SUBSEQUENT EVENT (Details) Sheet http://www.dicerna.com/role/SUBSEQUENTEVENTDetails SUBSEQUENT EVENT (Details) Details http://www.dicerna.com/role/SUBSEQUENTEVENT 39 false false R9999.htm Uncategorized Items - drna-20200331.htm Sheet http://xbrl.sec.gov/role/uncategorizedFacts Uncategorized Items - drna-20200331.htm Cover 40 false false All Reports Book All Reports drna-20200331.htm drna-20200331.xsd drna-20200331_cal.xml drna-20200331_def.xml drna-20200331_lab.xml drna-20200331_pre.xml drnaex311.htm drnaex312.htm drnaex321.htm rosskampralf-transitio.htm drna-20200331_g1.jpg drna-20200331_g2.jpg http://fasb.org/srt/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/us-gaap/2019-01-31 true true