3.4.0.3 html 56 165 1 true 29 0 false 5 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://www.sunesis.com/20160331/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) Sheet http://www.sunesis.com/20160331/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSUnaudited CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) Statements 2 false false R3.htm 100020 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) Sheet http://www.sunesis.com/20160331/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVELOSSUnaudited CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) Statements 3 false false R4.htm 100030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) Sheet http://www.sunesis.com/20160331/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) Statements 4 false false R5.htm 100040 - Disclosure - Company Overview Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureCompanyOverview Company Overview Notes 5 false false R6.htm 100050 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 6 false false R7.htm 100060 - Disclosure - Loss per Common Share Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureLossPerCommonShare Loss per Common Share Notes 7 false false R8.htm 100070 - Disclosure - Financial Instruments Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureFinancialInstruments Financial Instruments Notes 8 false false R9.htm 100080 - Disclosure - Royalty Agreement Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureRoyaltyAgreement Royalty Agreement Notes 9 false false R10.htm 100090 - Disclosure - License Agreements Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureLicenseAgreements License Agreements Notes 10 false false R11.htm 100100 - Disclosure - Notes Payable Notes http://www.sunesis.com/20160331/taxonomy/role/DisclosureNotesPayable Notes Payable Notes 11 false false R12.htm 100110 - Disclosure - Stockholders' Equity Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureStockholdersEquity Stockholders' Equity Notes 12 false false R13.htm 100120 - Disclosure - Stock-Based Compensation Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureStockBasedCompensation Stock-Based Compensation Notes 13 false false R14.htm 100130 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.sunesis.com/20160331/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 14 false false R15.htm 100140 - Disclosure - Loss per Common Share (Tables) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureLossPerCommonShareTables Loss per Common Share (Tables) Tables http://www.sunesis.com/20160331/taxonomy/role/DisclosureLossPerCommonShare 15 false false R16.htm 100150 - Disclosure - Financial Instruments (Tables) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureFinancialInstrumentsTables Financial Instruments (Tables) Tables http://www.sunesis.com/20160331/taxonomy/role/DisclosureFinancialInstruments 16 false false R17.htm 100160 - Disclosure - Notes Payable (Tables) Notes http://www.sunesis.com/20160331/taxonomy/role/DisclosureNotesPayableTables Notes Payable (Tables) Tables http://www.sunesis.com/20160331/taxonomy/role/DisclosureNotesPayable 17 false false R18.htm 100170 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.sunesis.com/20160331/taxonomy/role/DisclosureStockBasedCompensation 18 false false R19.htm 100180 - Disclosure - Company Overview - Additional Information (Detail) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail Company Overview - Additional Information (Detail) Details 19 false false R20.htm 100190 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail Summary of Significant Accounting Policies - Additional Information (Detail) Details 20 false false R21.htm 100200 - Disclosure - Loss per Common Share - Schedule of Potential Common Shares Issuable Pursuant to Outstanding Securities Excluded from Computation of Diluted Loss per Common Share (Detail) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureLossPerCommonShareScheduleOfPotentialCommonSharesIssuablePursuantToOutstandingSecuritiesExcludedFromComputationOfDilutedLossPerCommonShareDetail Loss per Common Share - Schedule of Potential Common Shares Issuable Pursuant to Outstanding Securities Excluded from Computation of Diluted Loss per Common Share (Detail) Details 21 false false R22.htm 100210 - Disclosure - Financial Instruments - Fair Value of Company's Financial Assets Measured on Recurring Basis (Detail) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureFinancialInstrumentsFairValueOfCompanySFinancialAssetsMeasuredOnRecurringBasisDetail Financial Instruments - Fair Value of Company's Financial Assets Measured on Recurring Basis (Detail) Details 22 false false R23.htm 100220 - Disclosure - Financial Instruments - Additional Information (Detail) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureFinancialInstrumentsAdditionalInformationDetail Financial Instruments - Additional Information (Detail) Details 23 false false R24.htm 100230 - Disclosure - Royalty Agreement - Additional Information (Detail) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureRoyaltyAgreementAdditionalInformationDetail Royalty Agreement - Additional Information (Detail) Details 24 false false R25.htm 100240 - Disclosure - License Agreements - Additional Information (Detail) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureLicenseAgreementsAdditionalInformationDetail License Agreements - Additional Information (Detail) Details 25 false false R26.htm 100250 - Disclosure - Notes Payable - Additional Information (Detail) Notes http://www.sunesis.com/20160331/taxonomy/role/DisclosureNotesPayableAdditionalInformationDetail Notes Payable - Additional Information (Detail) Details 26 false false R27.htm 100260 - Disclosure - Notes Payable - Summary of Future Minimum Payments Under Loan Agreement (Detail) Notes http://www.sunesis.com/20160331/taxonomy/role/DisclosureNotesPayableSummaryOfFutureMinimumPaymentsUnderLoanAgreementDetail Notes Payable - Summary of Future Minimum Payments Under Loan Agreement (Detail) Details 27 false false R28.htm 100280 - Disclosure - Stockholders' Equity - Additional Information (Detail) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureStockholdersEquityAdditionalInformationDetail Stockholders' Equity - Additional Information (Detail) Details 28 false false R29.htm 100290 - Disclosure - Stock-Based Compensation - Summary of Stock-Based Compensation Expense Related to Company's Stock-Based Awards (Detail) Sheet http://www.sunesis.com/20160331/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockBasedCompensationExpenseRelatedToCompanySStockBasedAwardsDetail Stock-Based Compensation - Summary of Stock-Based Compensation Expense Related to Company's Stock-Based Awards (Detail) Details 29 false false All Reports Book All Reports snss-20160331.xml snss-20160331.xsd snss-20160331_cal.xml snss-20160331_def.xml snss-20160331_lab.xml snss-20160331_pre.xml true true