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Stock-based compensation - Additional information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expense   $ 4,118 $ 833  
Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 1,300 $ 400  
Weighted average fair value of options to purchase common stock granted   $ 7.19 $ 1.01  
Unrecognized compensation cost   $ 5,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   1 year 4 months 24 days    
General and Administrative Expense        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expense   $ 1,573 $ 233  
General and Administrative Expense | Former Chief Executive Officer [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total stock-based compensation expense   $ 300    
The2019 Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares For Future Issuance 9,496,699     3,657,019
Shares Available For Future Grants   6,716,195    
Unvested shares   0 410,602  
Deferred Compensation Liability Current And Noncurrent   $ 0 $ 800