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Acquisitions, Research Collaborations and License Agreements (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2021	Mar. 31, 2021
Artiva Biotherapeutics, Inc. | Licensing Agreements
Business Acquisition [Line Items]
Upfront and milestone payments	$ 30.0
Upfront and milestone payments to be made	$ 15.0
Artiva Biotherapeutics, Inc. | Licensing Agreements | Minimum
Business Acquisition [Line Items]
Royalty rate	7.00%
Artiva Biotherapeutics, Inc. | Licensing Agreements | Maximum
Business Acquisition [Line Items]
Royalty rate	14.00%
Artiva Biotherapeutics, Inc. | Licensing Agreements | Development Milestones
Business Acquisition [Line Items]
Contingent milestone payments collaborative arrangement	$ 217.5
Artiva Biotherapeutics, Inc. | Licensing Agreements | Regulatory Milestones
Business Acquisition [Line Items]
Contingent milestone payments collaborative arrangement	570.0
Artiva Biotherapeutics, Inc. | Licensing Agreements | Sales-Based Milestones
Business Acquisition [Line Items]
Contingent milestone payments collaborative arrangement	$ 1,050.0
COVID-19
Business Acquisition [Line Items]
Charges related to program discontinuation		$ 170.0

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