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Borrowings - Net finance expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Interest on lease obligations $ 358 $ 278
Interest income (317) 0
Bank fees and other 13 43
Net finance expense 130 796
Secured debentures    
Disclosure of detailed information about borrowings [line items]    
Interest and accretion expense 0 313
Convertible promissory notes    
Disclosure of detailed information about borrowings [line items]    
Interest expense 0 74
Credit facility    
Disclosure of detailed information about borrowings [line items]    
Interest expense $ 76 $ 88