Quarterly report pursuant to Section 13 or 15(d)

Share-based compensation - Narrative (Details)

v3.22.2
Share-based compensation - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense $ 0   $ 0  
Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grant 1,050,853   1,050,853  
Vesting period     10 years  
Aggregate grant date fair value     $ 839,350  
Exercise price     $ 4.23  
Granted     262,500  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Expected dividends     $ 0  
Fair market value     $ 4.23  
Plan | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Discount rates     3.145%  
Expected life     5 years 6 months  
Expected volatility     90.62%  
Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Discount rates     3.15%  
Expected life     6 years  
Expected volatility     91.86%  
Plan | Vesting over one year        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     100.00%  
Plan | Vesting after one year        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.333%  
Plan | Vesting in 24 monthly installments thereafter        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     66.667%  
Plan | Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense $ 1,397,889   $ 1,397,889  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Abstract]        
Share-based compensation expense $ 136,957 $ 34,244 $ 268,863 $ 59,069