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Stock-Based Compensation - Employee Earnout RSUs and CEO Earnout RSUs (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 23, 2020
D
tranche
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   25.00%  
Stock based compensation expense | $   $ 16,835 $ 672
CEO and Founder | Employee earnout restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued | shares 1,000,000    
Vesting percentage 33.33%    
Threshold trading days | D 20    
Threshold consecutive trading days | D 30    
Threshold period 36 months    
Vesting period 1 year    
Average grant date fair value $ 12.08    
Stock based compensation expense | $   6,228  
Cost not recognized | $   $ 5,526  
Shares vested | shares   333,333  
CEO and Founder | Employee earnout restricted stock | Common stock is greater than or equal to $18.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold closing price of common stock 18.00    
CEO and Founder | Employee earnout restricted stock | Common stock is greater than or equal to $20.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold closing price of common stock 20.00    
CEO and Founder | Employee earnout restricted stock | Common stock is greater than or equal to $22.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold closing price of common stock $ 22.00    
Employee awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation expense | $   $ 2,529 $ 672
Employee awards | Employees | Employee earnout restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued | shares 1,003,317    
Vesting percentage 33.33%    
Number of tranches | tranche 3    
Threshold trading days | D 20    
Threshold consecutive trading days | D 30    
Threshold period 36 months    
Vesting period 1 year    
Average grant date fair value $ 12.08 $ 16.78  
Stock based compensation expense | $   $ 6,153  
Cost not recognized | $   $ 5,476  
Shares forfeited | shares   19,838  
Shares granted | shares   3,918  
Vesting of earnout shares (in shares) | shares   329,132  
Employee awards | Employees | Employee earnout restricted stock | Common stock is greater than or equal to $18.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold closing price of common stock 18.00    
Employee awards | Employees | Employee earnout restricted stock | Common stock is greater than or equal to $20.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold closing price of common stock 20.00    
Employee awards | Employees | Employee earnout restricted stock | Common stock is greater than or equal to $22.00      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold closing price of common stock $ 22.00