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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2020
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Number of shares        
Outstanding as at beginning of period (in shares)   5,768,028    
Granted (in shares)   2,663,650    
Exercised (in shares) (135,525) (22,744)    
Forfeited (in shares)   (40,581)    
Outstanding as at end of period (in shares)   8,368,353 5,768,028  
Options vested and exercisable as at end of period (in shares)   2,138,539    
Options expected to vest as at end of period (in shares)   6,229,814    
Weighted Average Exercise Price        
Outstanding as at beginning of period (in dollars per share)   $ 15.99    
Granted (in dollars per share)   7.07    
Exercised (in dollars per share)   4.02    
Forfeited (in dollars per share)   22.39    
Outstanding at end of period (in dollars per share)   13.16 $ 15.99  
Options vested and exercisable as at end of period (in dollars per share)   13.44    
Options expected to vest as at end of period (in dollars per share)   $ 13.06    
Weighted Average Remaining Contractual Life        
Weighted Average Remaining Contractual Life of outstanding options (in years)   8 years 9 months 3 days 8 years 9 months 25 days  
Weighted Average Remaining Contractual Life of vested and exercisable options (in years)   8 years 3 months 14 days    
Weighted Average Remaining Contractual Life of expected to vest options (in years)   8 years 11 months 1 day    
Intrinsic Value of outstanding options   $ 1,031 $ 11,365  
Intrinsic Value of vested and exercisable options   710    
Intrinsic Value of expected to vest options   $ 321    
Unvested early exercised stock options   39,609   39,609
Number of shares vested   95,916