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Equity Incentive Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 06, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares outstanding awarded   8,538,060 5,107,329  
Stock options granted during period   4,194,624 5,143,551 0
Stock options exercised during the year   419,593    
Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted-average period of cost expects to recognize   2 years 9 months 18 days    
Unrecognized compensation costs   $ 13.5    
Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected dividend yield   0.00% 0.00%  
Weighted-average grant date fair value per share   $ 13.17 $ 4.87  
Aggregate fair value of stock options vested during period   $ 7.2 $ 0.1  
Aggregate intrinsic value of stock options exercised during period   6.9    
Unrecognized compensation costs   $ 61.0    
Weighted-average period of cost expects to recognize   2 years 10 months 24 days    
Stock options exercised during the year     0  
2019 Equity Incentive Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of share reserved for future issuance 5,750,000      
Term of awards 10 years      
Percentage of amount increase in outstanding shares 5.00%      
Common stock available for issuance   1,751,485    
Shares outstanding awarded   4,003,040    
2019 Employee Stock Purchase Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of share reserved for future issuance 700,000 700,000    
Term of awards 10 years      
Percentage of amount increase in outstanding shares 1.00%      
2019 Employee Stock Purchase Plan | Stock-Based Compensation Expense        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unrecognized compensation costs   $ 1.3    
Weighted-average period of cost expects to recognize   1 year 1 month 6 days    
2019 Employee Stock Purchase Plan | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Purchase of common stock through payroll deductions, percentage 20.00%      
2017 Equity Incentive Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares outstanding awarded   4,535,020    
2017 Equity Incentive Plan | Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted stock awards, Unvested   561,868