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Stock-Based Compensation - Employee Earnout RSUs and CEO Earnout RSUs (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 23, 2020
tranche
D
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage   25.00%   25.00%  
Stock based compensation expense | $   $ 16,835 $ 672 $ 11,296 $ 35,972
Cost not recognized | $       5,245  
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 9,680 $ 2,740
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   $ 314  
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]          
Vesting percentage 33.33%        
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