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Stock-Based Compensation - Narrative (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
shares
Oct. 31, 2019
USD ($)
shares
Dec. 31, 2021
USD ($)
period
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2011
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average grant date fair value, options granted (in dollars per share) | $ / shares     $ 5.22 $ 1.10 $ 1.23  
Aggregate grant-date fair value, options     $ 7,300,000 $ 5,400,000 $ 3,700,000  
Intrinsic value of options exercised     72,208,000 2,400,000 3,000,000  
Share-based compensation expense, accelerated cost         4,000,000  
Tax benefit, stock-based compensation expense     0 0 0  
Tax benefit, exercise of stock-based awards     $ 0 $ 0 $ 0  
Repurchase and retirement of common stock in connection with tender offer (in shares) | shares   2,053,690        
Repurchase and retirement of common stock, aggregate purchase price   $ 11,000,000        
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Repurchase and retirement of common stock in connection with tender offer (in shares) | shares         2,053,690  
Repurchase and retirement of common stock, aggregate purchase price, equity impact   (7,000,000)        
Accumulated Deficit            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Repurchase and retirement of common stock, aggregate purchase price, equity impact   7,000,000        
Additional Paid-in Capital            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Repurchase and retirement of common stock, aggregate purchase price, equity impact   $ 0        
Marketing            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense, accelerated cost         $ 200,000  
Technology and development            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense, accelerated cost         2,000,000  
General and administrative            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense, accelerated cost         $ 1,800,000  
Equity Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized | shares           43,899,677
2021 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized | shares 25,000,000          
Number of additional shares authorized | shares 552,736          
Common stock, reserved (in shares) | shares 25,552,736   23,599,005 206,529    
Common stock reserved for issuance, annual increase percentage 5.00%          
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of purchase periods | period     4      
Purchase period     6 months      
Consecutive offering period     24 months      
Maximum employee contribution rate     15.00%      
ESPP purchase price of common stock, percent of market price     85.00%      
Granted (in shares) | shares       0    
Unamortized compensation cost     $ 3,900,000      
Unamortized compensation cost, recognition period     1 year 8 months 12 days      
ESPP | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Consecutive offering period     27 months      
ESPP | 2021 ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized | shares 3,500,000          
Common stock, reserved (in shares) | shares     3,500,000      
Common stock reserved for issuance, annual increase percentage 1.00%          
Maximum number of shares available over award term | shares 35,000,000          
Number of shares issued | shares     0      
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Cliff vesting period     1 year      
Exercisable period     10 years      
Exercisable period, termination of service     3 months      
Stock options | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     2 years      
Stock options | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     4 years      
Performance sares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     4 years      
Cliff vesting period     1 year      
Share-based compensation expense, accelerated cost $ 1,100,000          
Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares     $ 27.16 $ 3.54    
Weighted-average aggregate grant date fair value, vested     $ 600,000 $ 0    
Vested (in shares) | shares     124,026   0  
Granted (in shares) | shares     3,112,492   0  
Unamortized compensation cost     $ 122,600,000      
Unamortized compensation cost, recognition period     3 years 3 months 18 days