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Stock-Based Compensation - Stock Option Activity (Details) - 2021 Equity Incentive Plan - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Number of options    
Beginning balance (in shares) 33,750  
Granted (in shares) 13,790  
Exercised (in shares) (12,988)  
Cancelled and forfeited (in shares) (2,877)  
Ending balance (in shares) 31,675 33,750
Vested and exercisable (in shares) 11,067  
Weighted average exercise price    
Beginning balance (in dollars per share) $ 1.74  
Granted (in dollars per share) 12.29  
Exercised (in dollars per share) 1.95  
Cancelled and forfeited (in dollars per share) 6.51  
Ending balance (in dollars per share) 5.81 $ 1.74
Vested and exercisable (in dollars per share) $ 2.18  
Weighted average remaining contractual life (in years) 8 years 3 days 7 years 11 months 12 days
Weighted average remaining contractual life, vested and exercisable (in years) 6 years 8 months 19 days  
Aggregate intrinsic value $ 108,826 $ 175,444
Aggregate intrinsic value, vested and exercisable $ 61,011