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Development and Other Agreements - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended
	Nov. 20, 2018	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 28, 2018
Development Agreements [Line Items]
Collaborative research and development fee		$ 87.1	$ 87.1	$ 0.0	$ 0.0
Collaborative Arrangement | Verily Life Sciences | Collaborative Arrangement, Initial Payment
Development Agreements [Line Items]
Initial payment on collaborative agreement	$ 250.0
Issuance of common stock in connection with acquisition, shares (in shares)	1,840,943
Collaborative research and development fee		$ 87.1				$ 217.7
Closing stock price (USD per share)							$ 118.28
Collaborative Arrangement | Verily Life Sciences | Collaborative Arrangement, Approval Milestone
Development Agreements [Line Items]
Potential future common stock issuable (shares)	736,377
Collaborative Arrangement | Verily Life Sciences | Collaborative Arrangement, Milestone Payments
Development Agreements [Line Items]
Collaborative research and development fee					$ 3.2
Potential future common stock issuable (shares)	1,288,660

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