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Leases - Maturities of lease liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]      
Total lease commitments $ 949    
Less: imputed lease interest (139)    
Total lease liabilities 810    
Current portion 379 $ 261  
Non-current portion $ 431 $ 320  
Average incremental borrowing rate applied to the lease liabilities 15.69% 15.78%  
Cash outflows related to leases $ 300 $ 300 $ 200
2023      
Disclosure of quantitative information about right-of-use assets [line items]      
Total lease commitments 459    
2024      
Disclosure of quantitative information about right-of-use assets [line items]      
Total lease commitments 284    
2025      
Disclosure of quantitative information about right-of-use assets [line items]      
Total lease commitments $ 206