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Share-based compensation - Option Activity and Restricted Stock (Details) - The Plans - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options, Beginning balance 2,005,756    
Options, Granted 21,100    
Options, Exercised (17,012)    
Options, Ending balance 2,009,844   2,005,756
Options, Exercisable 779,707    
Options, Vested or expected to vest 2,009,844    
Weighted Average Exercise price      
Beginning price $ 11.26    
Granted 10.58    
Exercised 1.87    
Ending price 11.33   $ 11.26
Exercisable 5.40    
Vested or expected to vest $ 11.33    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted Average Remaining Contractual Term 8 years 3 months 7 days   8 years 6 months
Weighted Average Remaining Contractual Term, Granted 9 years 9 months 25 days    
Weighted Average Remaining Contractual Term, Exercised 8 years 1 month 9 days    
Weighted Average Remaining Contractual Term, Exercisable 7 years 6 months 25 days    
Weighted Average Remaining Contractual Term, Vested or expected to vest 8 years 3 months 7 days    
Weighted average grant date fair value $ 7.52 $ 22.46  
Intrinsic value, exercised $ 0.1    
Intrinsic value, outstanding $ 4.0