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Income taxes - Rate reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Income before income taxes $ (7,318) $ (11,305)
Statutory tax rate 26.50% 26.50%
Tax at statutory rate $ (1,939) $ (2,996)
Foreign tax rate differential 71 175
Effect of permanent differences 1,164 922
Foreign exchange (865) 0
Change in unrecognized deferred tax asset 1,905 2,508
Total tax expense (income) $ 336 $ 609