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Share-based compensation - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jun. 11, 2020
Jun. 07, 2018
Sep. 17, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Share based compensation expense $ 0.5 $ 0.7      
Common stock reserved for issuance 5,069,255        
Options granted 484,254 254,700      
Share-based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock 110.00%        
Intrinsic value of options outstanding $ 8.9 $ 0.7      
Intrinsic value of options unvested $ 0.0 $ 0.0      
Employee Stock Option [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Stock option vesting period 2 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 463,754        
2014 Stock Incentive Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Common stock reserved for issuance         3,000,000
2018 Stock Incentive Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Common stock reserved for issuance       4,000,000  
2020 Stock Incentive Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Common stock reserved for issuance     3,000,000