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Collaboration with Verily Life Sciences (Details) - Verily Life Sciences - Collaborative Arrangement - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2018 | Dec. 31, 2019 | Mar. 31, 2022 | Dec. 28, 2018
Collaborative Arrangement, Initial Payment |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Closing stock price (USD per share) |  |  |  |  | $ 29.57
Initial payment on collaborative agreement |  | $ 250.0 |  |  |
Issuance of common stock in connection with achievement of regulatory approval milestone, net of issuance costs (in shares) |  | 7,363,772 |  |  |
Collaborative research and development fee | $ 87.1 | $ 217.7 |  |  |
Collaborative Arrangement, Milestone Payments |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Collaborative research and development fee |  |  | $ 3.2 |  |
Potential future common stock issuable (shares) |  |  |  | 5,154,640 |
Collaborative Arrangement, Approval Milestone |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Potential future common stock issuable (shares) |  |  |  | 2,945,508 |

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