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Stock-Based Compensation - Stock Option Activity (Details)
3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Number of Shares  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 18.45
Stock Options [Member]  
Number of Shares  
Outstanding - Beginning Balance | shares 7,027,941
Granted | shares 429,467
Exercised | shares (85,058)
Forfeited | shares (7,550)
Outstanding - Ending Balance | shares 7,364,800
Vested (exercisable) - December 31, 2021 | shares 5,624,632
Expected to vest after December 31, 2021 (unexercisable) | shares 1,740,168
Weighted-Average Exercise Price/Share  
Outstanding - Beginning Balance $ 13.97
Granted 32.18
Exercised 4.71
Forfeited 54.26
Outstanding - Ending Balance 15.09
Vested (exercisable) - December 31, 2021 9.99
Expected to vest after December 31, 2021 (unexercisable) $ 31.59
Weighted-Average Remaining Contractual Term (Years)  
Outstanding - December 31, 2021 5 years 8 months 12 days
Vested (exercisable) - December 31, 2021 5 years 2 months 12 days
Expected to vest after December 31, 2021 (unexercisable) 7 years 4 months 24 days
Aggregated Intrinsic Value  
Outstanding - December 31, 2021 | $ $ 158,839
Vested (exercisable) - December 31, 2021 | $ 143,609
Expected to vest after December 31, 2021 (unexercisable) | $ $ 15,229