Share-based compensation - Unregistered Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Share price	$ 10.00
Share-based compensation expense	$ 2,000,000
Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	229,984	519,163
Exercise price	$ 6.85	$ 10.00
Remaining contractual term	9 years 1 month 2 days	9 years 11 months 23 days
Intrinsic value of options outstanding	$ 0	$ 0
Intrinsic value of options exercisable	0	0
Aggregate grant date fair value	$ 1,150,284	$ 3,441,687
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Discount rates		0.39%
Expected life	5 years
Expected volatility		88.30%
Expected dividends	$ 0	$ 0
Fair market value		$ 9.80
Plan | Non-qualified stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	292,500
Term	10 years
Exercise price	$ 10.00
Vesting percentage	100.00%
Remaining contractual term	8 years 11 months 15 days
Unrecognized compensation expense	$ 0	$ 0
Intrinsic value of options outstanding	0
Aggregate grant date fair value	$ 1,987,831
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Discount rates	0.37%
Expected life	5 years
Expected volatility	88.30%
Expected dividends	$ 0
Share price	$ 10.00
Share-based compensation expense		$ 1,987,831