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Leases - Lease obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Balance – Beginning of period $ 3,414 $ 3,183
Additions 968 790
Disposals 0 (47)
Interest accretion 358 319
Lease repayments (1,106) (883)
Effects of foreign exchange 170 52
Balance – End of period 3,804 3,414
Current 1,260 935
Non-current 2,544 2,479
Short-term leases and leases of low-value assets $ 238 $ 215