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Share-based compensation - Option Activity and Restricted Stock (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2021
shares
Aug. 31, 2020
USD ($)
employee
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]          
Share-based Payment Arrangement, Expense | $   $ 0 $ 3,448 $ 621  
Fair value of option price per share | $ / shares         $ 8.69
Two Officers [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, Granted   92,169      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]          
Number Of Employees Granted Stock Options | employee   2      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]          
Share-based Payment Arrangement, Expense | $     $ 200 $ 0  
Awards granted 13,500        
Unvested restricted stock     0    
The Plans          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options, Beginning balance     1,472,840    
Options, Granted     803,481    
Options, Forfeited     (23,031)    
Options, Exercised     (247,534)    
Options, Ending balance     2,005,756 1,472,840  
Options, Exercisable     659,478    
Options, Vested or expected to vest     2,005,756    
Weighted Average Exercise price          
Beginning price | $ / shares     $ 3.14    
Granted | $ / shares     23.04    
Forfeited | $ / shares     19.88    
Exercised | $ / shares     0.40    
Ending price | $ / shares     11.26 $ 3.14  
Exercisable | $ / shares     3.14    
Vested or expected to vest | $ / shares     $ 11.26    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]          
Weighted Average Remaining Contractual Term     8 years 6 months 8 years 6 months 3 days  
Weighted Average Remaining Contractual Term, Granted     9 years 3 months    
Weighted Average Remaining Contractual Term, Exercised     5 years 2 months 15 days    
Weighted Average Remaining Contractual Term, Exercisable     7 years 7 months 6 days    
Weighted Average Remaining Contractual Term, Vested or expected to vest     8 years 6 months    
Weighted average grant date fair value | $ / shares     $ 16.49 $ 3.71  
Intrinsic value, exercised | $     $ 4,000 $ 1,200  
Intrinsic value, outstanding | $     $ 11,300 $ 10,100