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Long-term debt - CIBC Loan (Details) - CIBC loan
$ in Thousands, $ in Thousands
12 Months Ended
Feb. 04, 2020
USD ($)
Jul. 30, 2018
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]        
Total initial gross proceeds   $ 12,500    
Adjustment to interest rate basis (as a percent)   2.50%    
Amount repaid $ 9,317      
Changes during the period        
Balance - Beginning of period     $ 0 $ 9,135
Interest and accretion expense     0 472
Foreign exchange     0 (290)
Repayment     0 (9,317)
Balance - End of period     $ 0 $ 0