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Stock Compensation - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Apr. 20, 2021
Jan. 19, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Additional compensation expense $ 0 $ 1,900,000 $ 116,500,000    
Unrecognized stock compensation $ 51,800,000        
Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares repurchased during period (in shares) 97,600 868,640 59,412,200    
2016 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reserved for issuance (in shares) 9,104,749        
2021 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized issuance or sale of shares (in shares)       18,400,000  
Reserved for issuance (in shares) 18,262,924        
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock compensation, weighted-average period (in years) 2 years 8 months 12 days        
Stock options | 2016 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized issuance or sale of shares (in shares)         37,728,000
Vesting period (in years) 4 years        
Share grant expiration period (in years) 10 years        
Stock options | Tranche One | 2016 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 25.00%        
Employee stock purchase plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized issuance or sale of shares (in shares)       3,350,000