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Stock Options - Schedule of Common Stock Options Outstanding and related Activity (Details)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Share-based Payment Arrangement [Abstract]    
Number of Options, Beginning Balance | shares 10,215,834  
Number of Options, Granted | shares 1,736,755  
Number of Options, Exercised | shares (526,819)  
Number of Options, Canceled | shares (1,735,341)  
Number of Options, Expired | shares (7,560)  
Number of Options, Ending Balance | shares 9,682,869 10,215,834
Number of Options, Vested and exercisable | shares 6,325,893  
Weighted Average Exercise Prices, Beginning | $ / shares $ 0.45  
Weighted Average Exercise Prices, Granted | $ / shares 7.13  
Weighted Average Exercise Prices, Exercised | $ / shares 0.66  
Weighted Average Exercise Prices, Canceled | $ / shares 0.66  
Weighted Average Exercise Prices, Expired | $ / shares 0.12  
Weighted Average Exercise Prices, Ending | $ / shares 1.60 $ 0.45
Weighted Average Exercise Prices, Vested and exercisable | $ / shares $ 0.56  
Weighted Average Remaining Contractual Terms (years) 6 years 11 months 8 days 7 years 3 months 14 days
Weighted Average Remaining Contractual Terms (years), Vested and exercisable 5 years 11 months 19 days  
Aggregate Intrinsic Values, Beginning | $ $ 99,296  
Aggregate Intrinsic Values, Exercised | $ 1,537  
Aggregate Intrinsic Values, Ending | $ 41,252 $ 99,296
Aggregate Intrinsic Values, Vested and exercisable | $ $ 32,158