Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Income taxes - Disclosure of income tax recovery (Details)

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Income taxes - Disclosure of income tax recovery (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Expected recovery at the statutory rate $ (31,471) $ (17,312)
Non-taxable revaluation of warrant liabilities 10,450 2,688
Non-deductible expenses including stock compensation 2,178 2,157
Effect of change in future tax rate 2,955 0
Difference between statutory and deferred tax rate 721 0
Unrecognized deductible temporary differences 15,167 12,467
Income taxes related to foreign subsidiaries 144 73
Total income tax expense $ 144 $ 73
Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Statutory tax rate 25.41% 27.00%