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Development and Other Agreements - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 20, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 28, 2018
Development Agreements [Line Items] |  |  |  |  |
Collaborative research and development fee |  | $ 0.0 | $ 0.0 | $ 217.7 |
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 |  |  |  | $ 217.7 |
Closing stock price (USD per share) |  |  |  |  | $ 118.28
Collaborative Arrangement | Verily Life Sciences | Collaborative Arrangement, Milestone Payments |  |  |  |  |
Development Agreements [Line Items] |  |  |  |  |
Collaborative research and development fee |  | $ 0.0 | $ 3.2 |  |
Additional milestones and incentive payments | $ 275.0 |  |  |  |
Milestone payments due upon achievement of future development | $ 275.0 |  |  |  |
Potential future common stock issuable (shares) |  | 2,025,036 |  |  |
Consecutive days used to calculate volume weighted average trading price | 15 days |  |  |  |

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