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Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 09, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Common Stock        
Common stock, authorized   120,000,000   120,000,000
Price per share $ 30.00      
Issuance of stock (in shares) 5,750,000      
Net proceeds from issuance of common stock $ 161,731 $ 161,731    
Incremental compensation charge     $ 2,811  
Maximum | Underwriter option to purchase        
Common Stock        
Additional shares 750,000      
Former Chief Executive Officer, Keith Gottesdiener, M.D. | Minimum        
Common Stock        
Post-termination exercise period for vested options     90 days  
Former Chief Executive Officer, Keith Gottesdiener, M.D. | Maximum        
Common Stock        
Post-termination exercise period for vested options     2 years  
2017 Employee Stock Purchase Plan        
Common Stock        
Common stock reserved for issuance   10,039,110    
Shares available for future grant   983,993    
2017 Employee Stock Purchase Plan | Equity Option        
Common Stock        
Common stock reserved for issuance   6,365,832