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Stock options - Restricted Share Units Activity (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSU expense recognized $ 0.3 $ 0.1
Chief Financial Officer And Chief Compliance officer [Member]    
US Denominated RSU's    
Awarded 38  
Equity Incentive Plan | US Denominated RSU's    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested 26  
US Denominated RSU's    
Outstanding at beginning of period 219 0
Awarded 0 219
Forfeited (86)  
Released (98)  
Vested 26  
Outstanding at end of period 35 219
Equity Incentive Plan | US Denominated RSU's | Vesting on the first anniversary date of the grant    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Vesting percentage 33.00%  
US Denominated RSU's    
Awarded 34  
Equity Incentive Plan | US Denominated RSU's | Vesting on the last day of each subsequent month    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 4.17%