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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