Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] GlaxoSmithKline Intellectual Property Development Ltd. 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Cover [Abstract] Cash and cash equivalents: Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] General and administrative expense General and Administrative Expense [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Zanidatamab Zymeworks Zanidatamab Inc. [Member] Zymeworks Zanidatamab Inc. 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Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Discount rate Operating Lease, Weighted Average Discount Rate, Percent Schedule of Stock Options Granted Share-Based Payment Arrangement, Option, Activity [Table Text Block] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Schedule of Cash, Cash Equivalents and Marketable Securities Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Issuance of common stock upon vesting of restricted stock units (“RSUs”) Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to 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(“Daiichi Sankyo”): Daiichi Sankyo, Co., Ltd [Member] Daiichi sankyo, co., ltd. 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