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Stock-based Compensation - Additional Information (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 24 Months Ended
Jun. 08, 2020
USD ($)
employee
Dec. 31, 2019
USD ($)
employee
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2017
USD ($)
employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock reserved for issuance (shares) | shares     7,312,590   7,312,590    
Common stock available for grant (shares) | shares     1,750,178   1,750,178    
Stock-based compensation expense     $ 2.4 $ 0.4 $ 4.6 $ 0.8  
Proceeds from release of shares upon repayment         $ 1.3 0.0  
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period         4 years    
Expiration period         10 years    
Stock-based compensation expense     2.4 0.4 $ 4.5 0.7  
Repricing of stock options (shares) | shares   1,708,300          
Repricing of stock options, number of employees impacted | employee   198          
Repricing of stock options, exercise price, lower limit (usd per share) | $ / shares   $ 26.04          
Repricing of stock options, exercise price, upper limit (usd per share) | $ / shares   28.53          
Repricing of stock options, fair value (usd per share) | $ / shares   $ 23.69          
Repricing of stock options, incremental expense     0.1   0.2    
Repricing of stock options, unrecognized incremental expense   $ 1.4          
Repricing of stock options, unrecognized incremental expense, period for recognition   1 year 4 months 24 days          
Unrecognized expense     30.3   $ 30.3    
Unrecognized expense, period for recognition         1 year 4 months 24 days    
Executive | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense     0.1 $ 0.1 $ 0.1 $ 0.1  
Unrecognized expense     $ 0.1   $ 0.1    
Unrecognized expense, period for recognition         1 year    
Subscriptions receivable, number of employees | employee 2           2
Subscriptions receivable             $ 1.5
Subscriptions receivable, weighted average interest rate             1.90%
Proceeds from release of shares upon repayment $ 1.3