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Stock-Based Compensation - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Options Outstanding      
Beginning balance (in shares) 21,034,424    
Granted (in shares) 8,219,753    
Exercised (in shares) (4,495,889)    
Forfeited (in shares) (1,371,346)    
Ending balance (in shares) 23,386,942 21,034,424  
Vested and exercisable (in shares) 10,200,154    
Vested and expected to vest (in shares) 23,788,236    
Weighted-Average Exercise Price      
Beginning balance (in dollars per share) $ 1.88    
Granted (in dollars per share) 7.26    
Exercised (in dollars per share) 1.85    
Forfeited (in dollars per share) 3.16    
Ending balance (in dollars per share) 3.70 $ 1.88  
Vested and exercisable (in dollars per share) 1.77    
Vested and expected to vest (in dollars per share) $ 3.69    
Weighted-Average Remaining Contractual Life (Years)      
Outstanding 7 years 7 months 28 days 7 years 9 months 25 days  
Vested and exercisable 6 years 4 months 17 days    
Vested and expected to vest 7 years 7 months 28 days    
Aggregate Intrinsic Value      
Outstanding $ 395,676 $ 64,604  
Exercised 72,208 $ 2,400 $ 3,000
Vested and exercisable 192,296    
Vested and expected to vest $ 402,847