3.10.0.1 html 108 162 1 false 32 0 false 6 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.seattlegenetics.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 1001000 - Statement - Condensed Consolidated Balance Sheets Sheet http://www.seattlegenetics.com/role/CondensedConsolidatedBalanceSheets Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://www.seattlegenetics.com/role/CondensedConsolidatedBalanceSheetsParenthetical Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1002000 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) Sheet http://www.seattlegenetics.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeLoss Condensed Consolidated Statements of Comprehensive Income (Loss) Statements 4 false false R5.htm 1002001 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) Sheet http://www.seattlegenetics.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeLossParenthetical Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) Statements 5 false false R6.htm 1004000 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.seattlegenetics.com/role/CondensedConsolidatedStatementsOfCashFlows Condensed Consolidated Statements of Cash Flows Statements 6 false false R7.htm 2101100 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.seattlegenetics.com/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 7 false false R8.htm 2102100 - Disclosure - Revenue from Contracts with Customers Sheet http://www.seattlegenetics.com/role/RevenueFromContractsWithCustomers Revenue from Contracts with Customers Notes 8 false false R9.htm 2103100 - Disclosure - Acquisition of Cascadian Sheet http://www.seattlegenetics.com/role/AcquisitionOfCascadian Acquisition of Cascadian Notes 9 false false R10.htm 2104100 - Disclosure - Net Income (Loss) Per Share Sheet http://www.seattlegenetics.com/role/NetIncomeLossPerShare Net Income (Loss) Per Share Notes 10 false false R11.htm 2105100 - Disclosure - Common Stock Sheet http://www.seattlegenetics.com/role/CommonStock Common Stock Notes 11 false false R12.htm 2106100 - Disclosure - Investments Sheet http://www.seattlegenetics.com/role/Investments Investments Notes 12 false false R13.htm 2107100 - Disclosure - Fair Value Sheet http://www.seattlegenetics.com/role/FairValue Fair Value Notes 13 false false R14.htm 2108100 - Disclosure - Inventories Sheet http://www.seattlegenetics.com/role/Inventories Inventories Notes 14 false false R15.htm 2109100 - Disclosure - Legal Matters Sheet http://www.seattlegenetics.com/role/LegalMatters Legal Matters Notes 15 false false R16.htm 2110100 - Disclosure - Subsequent Event Sheet http://www.seattlegenetics.com/role/SubsequentEvent Subsequent Event Notes 16 false false R17.htm 2201201 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.seattlegenetics.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.seattlegenetics.com/role/SummaryOfSignificantAccountingPolicies 17 false false R18.htm 2302301 - Disclosure - Revenue from Contracts with Customers (Tables) Sheet http://www.seattlegenetics.com/role/RevenueFromContractsWithCustomersTables Revenue from Contracts with Customers (Tables) Tables http://www.seattlegenetics.com/role/RevenueFromContractsWithCustomers 18 false false R19.htm 2303301 - Disclosure - Acquisition of Cascadian (Tables) Sheet http://www.seattlegenetics.com/role/AcquisitionOfCascadianTables Acquisition of Cascadian (Tables) Tables http://www.seattlegenetics.com/role/AcquisitionOfCascadian 19 false false R20.htm 2304301 - Disclosure - Net Income (Loss) Per Share (Tables) Sheet http://www.seattlegenetics.com/role/NetIncomeLossPerShareTables Net Income (Loss) Per Share (Tables) Tables http://www.seattlegenetics.com/role/NetIncomeLossPerShare 20 false false R21.htm 2306301 - Disclosure - Investments (Tables) Sheet http://www.seattlegenetics.com/role/InvestmentsTables Investments (Tables) Tables http://www.seattlegenetics.com/role/Investments 21 false false R22.htm 2307301 - Disclosure - Fair Value (Tables) Sheet http://www.seattlegenetics.com/role/FairValueTables Fair Value (Tables) Tables http://www.seattlegenetics.com/role/FairValue 22 false false R23.htm 2308301 - Disclosure - Inventories (Tables) Sheet http://www.seattlegenetics.com/role/InventoriesTables Inventories (Tables) Tables http://www.seattlegenetics.com/role/Inventories 23 false false R24.htm 2401402 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.seattlegenetics.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail Summary of Significant Accounting Policies - Additional Information (Detail) Details 24 false false R25.htm 2402402 - Disclosure - Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers Cumulative Effect (Detail) Sheet http://www.seattlegenetics.com/role/RevenueFromContractsWithCustomersSummaryOfRevenueFromContractsWithCustomersCumulativeEffectDetail Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers Cumulative Effect (Detail) Details 25 false false R26.htm 2402403 - Disclosure - Revenue from Contracts with Customers - Additional Information (Detail) Sheet http://www.seattlegenetics.com/role/RevenueFromContractsWithCustomersAdditionalInformationDetail Revenue from Contracts with Customers - Additional Information (Detail) Details 26 false false R27.htm 2402404 - Disclosure - Revenue from Contracts with Customers - Summary of Collaboration and License Agreement Revenues by Collaborator (Detail) Sheet http://www.seattlegenetics.com/role/RevenueFromContractsWithCustomersSummaryOfCollaborationAndLicenseAgreementRevenuesByCollaboratorDetail Revenue from Contracts with Customers - Summary of Collaboration and License Agreement Revenues by Collaborator (Detail) Details 27 false false R28.htm 2402405 - Disclosure - Revenue from Contracts with Customers - Schedule of Revenue from Contracts with Customers Impacts (Detail) Sheet http://www.seattlegenetics.com/role/RevenueFromContractsWithCustomersScheduleOfRevenueFromContractsWithCustomersImpactsDetail Revenue from Contracts with Customers - Schedule of Revenue from Contracts with Customers Impacts (Detail) Details 28 false false R29.htm 2403402 - Disclosure - Acquisition of Cascadian - Additional Information (Detail) Sheet http://www.seattlegenetics.com/role/AcquisitionOfCascadianAdditionalInformationDetail Acquisition of Cascadian - Additional Information (Detail) Details 29 false false R30.htm 2403403 - Disclosure - Acquisition of Cascadian - Schedule of Purchase Price Allocation of Assets Acquired and Liabilities Assumed (Detail) Sheet http://www.seattlegenetics.com/role/AcquisitionOfCascadianScheduleOfPurchasePriceAllocationOfAssetsAcquiredAndLiabilitiesAssumedDetail Acquisition of Cascadian - Schedule of Purchase Price Allocation of Assets Acquired and Liabilities Assumed (Detail) Details 30 false false R31.htm 2403404 - Disclosure - Acquisition of Cascadian - Schedule of Business Acquisition, Unaudited Pro Forma Information (Detail) Sheet http://www.seattlegenetics.com/role/AcquisitionOfCascadianScheduleOfBusinessAcquisitionUnauditedProFormaInformationDetail Acquisition of Cascadian - Schedule of Business Acquisition, Unaudited Pro Forma Information (Detail) Details 31 false false R32.htm 2404402 - Disclosure - Net Income (Loss) Per Share - Additional Information (Detail) Sheet http://www.seattlegenetics.com/role/NetIncomeLossPerShareAdditionalInformationDetail Net Income (Loss) Per Share - Additional Information (Detail) Details http://www.seattlegenetics.com/role/NetIncomeLossPerShareTables 32 false false R33.htm 2404403 - Disclosure - Net Income (Loss) Per Share - Schedule of Basic and Diluted Net Income (Loss) Per Share (Details) Sheet http://www.seattlegenetics.com/role/NetIncomeLossPerShareScheduleOfBasicAndDilutedNetIncomeLossPerShareDetails Net Income (Loss) Per Share - Schedule of Basic and Diluted Net Income (Loss) Per Share (Details) Details http://www.seattlegenetics.com/role/NetIncomeLossPerShareTables 33 false false R34.htm 2405401 - Disclosure - Common Stock - Additional Information (Detail) Sheet http://www.seattlegenetics.com/role/CommonStockAdditionalInformationDetail Common Stock - Additional Information (Detail) Details 34 false false R35.htm 2406402 - Disclosure - Investments - Additional Information (Detail) Sheet http://www.seattlegenetics.com/role/InvestmentsAdditionalInformationDetail Investments - Additional Information (Detail) Details 35 false false R36.htm 2406403 - Disclosure - Investments Investments - Summary of Debt Securities (Details) Sheet http://www.seattlegenetics.com/role/InvestmentsInvestmentsSummaryOfDebtSecuritiesDetails Investments Investments - Summary of Debt Securities (Details) Details 36 false false R37.htm 2407402 - Disclosure - Fair Value - Summary of Fair Value Hierarchy of Assets Carried at Fair Value and Measured on a Recurring Basis (Detail) Sheet http://www.seattlegenetics.com/role/FairValueSummaryOfFairValueHierarchyOfAssetsCarriedAtFairValueAndMeasuredOnRecurringBasisDetail Fair Value - Summary of Fair Value Hierarchy of Assets Carried at Fair Value and Measured on a Recurring Basis (Detail) Details 37 false false R38.htm 2408402 - Disclosure - Inventories - Schedule of Inventories (Detail) Sheet http://www.seattlegenetics.com/role/InventoriesScheduleOfInventoriesDetail Inventories - Schedule of Inventories (Detail) Details 38 false false R39.htm 2409401 - Disclosure - Legal Matters - Additional Information (Details) Sheet http://www.seattlegenetics.com/role/LegalMattersAdditionalInformationDetails Legal Matters - Additional Information (Details) Details 39 false false R40.htm 2410401 - Disclosure - Subsequent Event (Details) Sheet http://www.seattlegenetics.com/role/SubsequentEventDetails Subsequent Event (Details) Details http://www.seattlegenetics.com/role/SubsequentEvent 40 false false All Reports Book All Reports sgen-20180930.xml sgen-20180930.xsd sgen-20180930_cal.xml sgen-20180930_def.xml sgen-20180930_lab.xml sgen-20180930_pre.xml http://fasb.org/srt/2018-01-31 http://xbrl.sec.gov/dei/2018-01-31 http://xbrl.sec.gov/invest/2013-01-31 http://fasb.org/us-gaap/2018-01-31 true true