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Equity-based Compensation - Activity for options (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Number of Options    
Beginning Balance (in shares) | shares   4,587,865
Options granted (in shares) | shares 0 67,232
Options exercised (in shares) | shares (4,996) (25,783)
Options forfeited (in shares) | shares   (161,479)
Options expired (in shares) | shares   (148,843)
Ending Balance (in shares) | shares 4,318,992 4,318,992
Exercisable as of September 30, 2021 | shares 3,023,934 3,023,934
Vested and expected to vest as of September 30, 2021 | shares 3,982,080 3,982,080
Weighted Average Exercise Price    
Beginning Balance (in dollars per share) | $ / shares   $ 0.98
Options granted (in dollars per share) | $ / shares   2.25
Options exercised (in dollars per share) | $ / shares   0.73
Options forfeited (in dollars per share) | $ / shares   1.12
Options expired (in dollars per share) | $ / shares   0.94
Ending Balance (in dollars per share) | $ / shares $ 1.00 1.00
Exercisable as of September 30, 2021 | $ / shares 0.92 0.92
Vested and expected to vest as of September 30, 2021 | $ / shares $ 1.00 $ 1.00
Aggregate Intrinsic Value    
Aggregate Intrinsic Value | $ $ 22,213 $ 22,213
Aggregate Intrinsic Value - Exercisable as of September 30, 2021 | $ 15,800 15,800
Aggregate Intrinsic Value - Vested and expected to vest as of September 30, 2021 | $ $ 20,494 $ 20,494
Weighted Average Remaining Contractual Life (Years)   6 years 4 months 24 days
Weighted Average Remaining Contractual Life -Exercisable as of September 30, 2021   5 years 7 months 6 days
Weighted Average Remaining Contractual Life - Vested and expected to vest as of September 30, 2021   6 years 3 months 18 days