Annual report pursuant to Section 13 and 15(d)

Share-based compensation - Unregistered Securities (Details)

v3.22.4
Share-based compensation - Unregistered Securities (Details) - USD ($)
12 Months Ended
Sep. 19, 2022
Jun. 16, 2022
Dec. 31, 2022
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]          
Discount rates 3.69%        
Expected life 5 years        
Expected volatility 96.46%        
Share price $ 0.50        
Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted     912,500 229,984  
Options term   10 years      
Exercise price     $ 1.42 $ 6.85  
Remaining contractual term     9 years 14 days 9 years 1 month 2 days 9 years 11 months 23 days
Intrinsic value of options outstanding     $ 0 $ 0  
Plan | Non-qualified stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted     292,500    
Exercise price     $ 10.00    
Vesting percentage     100.00%    
Remaining contractual term     7 years 11 months 15 days    
Unrecognized compensation expense     $ 0    
Term     10 years    
Intrinsic value of options outstanding     $ 0