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Stock-based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 18, 2020
Apr. 16, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock reserved for future issuance (in shares) 7,000,000          
Minimum vesting period restriction         12 months  
Share-based compensation expense     $ 7.3 $ 2.4 $ 11.1 $ 4.1
Employee Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized for award (in shares)   500,000        
Purchase plan, discount from market price   85.00%        
Minimum | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 7 years          
Maximum | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 10 years