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Stock-Based Compensation - Summary of Activity for Service-based Stock Options (Details) - 2019 Plan - Service Based Stock Options - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Options and Unvested Shares, beginning balance 5,571,293  
Number of Options and Unvested Shares, granted 1,087,058  
Number of Options and Unvested Shares, exercised (23,389)  
Number of Options and Unvested Shares, cancelled / forfeited (411,564)  
Number of Options and Unvested Shares, ending balance 6,223,398 5,571,293
Number of Options and Unvested Shares, vested and expected to vest 6,223,398  
Number of Options and Unvested Shares, exercisable 2,557,002  
Weighted Average Exercise Price, beginning balance $ 28.70  
Weighted Average Exercise Price, vested 13.22  
Weighted Average Exercise Price, exercised 0.58  
Weighted Average Exercise Price, exercised, cancelled / forfeited 36.68  
Weighted Average Exercise Price, ending balance 25.58 $ 28.70
Weighted Average Exercise Price, vested and expected to vest 25.58  
Weighted Average Exercise Price, exercisable $ 20.81  
Weighted average remaining contractual life 8 years 1 month 28 days 8 years 3 months 3 days
Weighted average remaining contractual life, vested and expected to vest 8 years 1 month 28 days  
Weighted average remaining contractual life, exercisable 7 years 3 days  
Aggregate intrinsic value $ 5,225 $ 15,687
Aggregate intrinsic value, vested and expected to vest 5,225  
Aggregate intrinsic value, exercisable $ 4,513