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Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 06, 2020
Oct. 18, 2019
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Common Stock          
Common Stock, Shares Authorized       120,000,000 120,000,000
Price per share   $ 18.50      
Issuance of stock (in shares)   9,324,324      
Net proceeds   $ 161,352      
Underwriter option to purchase          
Common Stock          
Issuance of stock (in shares)   1,216,216      
2017 Employee Stock Purchase Plan          
Common Stock          
Common Stock, Capital Shares Reserved for Future Issuance       8,605,820  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       1,012,372  
2017 Employee Stock Purchase Plan | Equity Option          
Common Stock          
Common Stock, Capital Shares Reserved for Future Issuance       7,593,448  
Employees stock purchase plan | Separation Agreement | Dr. Gottesdiener          
Common Stock          
Incremental compensation charge     $ 2,811    
Employees stock purchase plan | Separation Agreement | Dr. Gottesdiener | Minimum          
Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award, Post-termination Exercise Period 90 days        
Employees stock purchase plan | Separation Agreement | Dr. Gottesdiener | Maximum          
Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award, Post-termination Exercise Period 2 years