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Stock Based Awards - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options, Outstanding at beginning of period 27,591 23,669 4,015  
Options, Retroactive conversion of shares due to business combination     26,232  
Options, Outstanding converted     30,247  
Options,granted 1,559 5,258 3,375  
Issuance of common stock upon exercise of stock options, shares 2,490 0 576  
Options,forfeited (1,084) (1,336) (9,377)  
Options, Outstanding at end of period 25,576 27,591 23,669 4,015
Options exercisable 19,065      
Options, Vested and expected to vest 25,576      
Weighted Average Exercise Price        
Weighted average exercise price per share, outstanding beginning of period $ 0.68 $ 0.55 $ 2.81  
Weighted Average Exercise Price per share, retroactive conversion of shares due to business combination     (2.44)  
Weighted average exercise price per share, Outstanding converted     0.37  
Weighted average exercise price per share, Granted 1.22 1.22 1.24  
Weighted average exercise price per share, Exercised 0.36   0.29  
Weighted average exercise price per share, Forfeited 0.85 0.54 0.25  
Weighted average exercise price per share, Outstanding at end of period 0.73 $ 0.68 $ 0.55 $ 2.81
Weighted average exercise price per share, Exercisable 0.62      
Weighted average exercise price per share, Vested and expected to vest $ 0.73      
Weighted average remaining contractual term 6 years 9 months 25 days 7 years 4 months 24 days 7 years 8 months 15 days 8 years 10 months 2 days
Weighted average remaining contractual term, Outstanding converted       8 years 10 months 2 days
Weighted average remaining contractual term, Exercisable 6 years 3 months 21 days      
Weighted average exercise price per share, Vested and expected to vest 6 years 9 months 25 days      
Aggregate intrinsic value, Outstanding beginning of period $ 14,619 $ 16,275 $ 22,106  
Aggregate intrinsic value, Outstanding converted     22,106  
Aggregate intrinsic value, Outstanding end of period 137,170 $ 14,619 $ 16,275 $ 22,106
Aggregate intrinsic value, Exercisable 86,526      
Aggregate intrinsic value, Vested and expected to vest $ 137,170      
Options Issued Under Plan        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options, Outstanding at beginning of period 26,075 23,117 3,947  
Options, Retroactive conversion of shares due to business combination     25,786  
Options, Outstanding converted     29,733  
Options,granted 1,559 4,294 3,337  
Issuance of common stock upon exercise of stock options, shares 1,947 0 576  
Options,forfeited (526) (1,336) (9,377)  
Options, Outstanding at end of period 25,161 26,075 23,117 3,947
Nonemployee Options        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options, Outstanding at beginning of period 1,516 552 68  
Options, Retroactive conversion of shares due to business combination     446  
Options, Outstanding converted     514  
Options,granted 964 38  
Issuance of common stock upon exercise of stock options, shares 543 0  
Options,forfeited (558)  
Options, Outstanding at end of period 415 1,516 552 68