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Equity-Based Compensation - Schedule of Stock Options Rollforward (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Options      
Outstanding beginning balance (in shares)   7,227,296  
Granted (in shares)   4,427,586  
Exercise of options (in shares) (22,240) (342,246)  
Forfeited (in shares)   (252,681)  
Outstanding ending balance (in shares)   11,059,955 7,227,296
Exercisable (in shares)   5,207,872  
Vested and expected to vest (in shares)   10,630,872  
Weighted-Average Exercise Price      
Outstanding beginning balance (in dollars per share)   $ 2.24  
Granted (in dollars per share)   1.87  
Exercised (in dollars per share)   1.60  
Forfeited (in dollars per share)   2.38  
Outstanding ending balance (in dollars per share)   2.11 $ 2.24
Exercisable, weighted-average exercise price (in dollars per share)   2.27  
Vested and expected to vest, weighted-average exercise price (in dollars per share)   $ 2.11  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted-Average Remaining Contractual Term (years)   7 years 6 months 6 years 9 months 18 days
Aggregate Intrinsic Value (thousands)   $ 397 $ 1,719
Exercisable, weighted-average remaining contractual term   5 years 8 months 12 days  
Exercisable, aggregate intrinsic value   $ 389  
Weighted-Average Remaining Contractual Term (years)   7 years 6 months  
Aggregate Intrinsic Value (thousands)   $ 396