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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
Jul. 02, 2020
Jul. 07, 2020
Jun. 30, 2020
Dec. 31, 2019
Subsequent Event [Line Items]        
Common stock, authorized (shares)     52,000,000 52,000,000
Common stock, par value (usd per share)     $ 0.00001 $ 0.00001
Common stock reserved for issuance (shares)     7,312,590  
Subsequent event        
Subsequent Event [Line Items]        
Common stock, authorized (shares)   200,000,000    
Common stock, par value (usd per share)   $ 0.00001    
Preferred stock, authorized (shares)   10,000,000    
Preferred stock, par value (usd per share)   $ 0.00001    
Subsequent event | 2020 Incentive Compensation Plan        
Subsequent Event [Line Items]        
Common stock reserved for issuance (shares) 5,503,678      
Common stock reserved for issuance, annual increase, percentage of outstanding shares 5.00%      
Maximum shares that may be issued upon exercise of incentive stock options (shares) 3,650,000      
Subsequent event | 2020 Employee Stock Purchase Plan        
Subsequent Event [Line Items]        
Common stock reserved for issuance (shares) 1,000,000      
IPO | Subsequent event        
Subsequent Event [Line Items]        
Common stock sold (shares) 12,650,000      
Common stock sold, offering price (usd per share) $ 29      
Net proceeds from common stock sold $ 335.6      
Offering costs $ 3.5      
Underwriter's option | Subsequent event        
Subsequent Event [Line Items]        
Common stock sold (shares) 1,650,000