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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Outstanding Stock Options    
Beginning balance (in shares)   31,618,135
Granted (in shares) 0  
Exercised (in shares) (312,037)  
Forfeited (in shares) (1,026,950)  
Expired (in shares) (498,101)  
Repurchased (in shares) (542,615)  
Ending balance (in shares) 29,238,432  
Weighted Average Exercise Price    
Beginning balance (in dollars per share)   $ 0.48
Granted (in dollars per share) $ 0  
Exercised (in dollars per share) 0.48  
Forfeited (in dollars per share) 0.65  
Expired (in dollars per share) 0.19  
Repurchased (in dollars per share) 0.17  
Ending balance (in dollars per share) $ 0.48  
Stock options additional disclosures    
Options outstanding, weighted average contractual life 7 years 4 months 24 days 8 years 3 months 18 days
Options outstanding, aggregate intrinsic value $ 127,345 $ 112,548
Vested and expected to vest (in shares) 27,555,673  
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 0.48  
Vested and expected to vest, weighted average contractual life 7 years 3 months 18 days  
Vested and expected to vest, aggregate intrinsic value $ 120,250  
Vested and exercisable (in shares) 18,615,254  
Vested and exercisable, weighted average exercise price (in dollars per share) $ 0.41  
Vested and exercisable, weighted average contractual life 6 years 8 months 12 days  
Vested and exercisable, aggregate intrinsic value $ 82,475