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

Income taxes - Disclosure of income tax recovery (Details)

v3.19.1
Income taxes - Disclosure of income tax recovery (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Expected recovery at the statutory rate $ (17,312) $ (19,135)
Non-taxable revaluation of warrant liabilities 2,688 6,459
Non-deductible expenses including stock compensation 2,157 1,418
Unrecognized deductible temporary differences 12,467 11,258
Income taxes related to foreign subsidiaries 73 0
Total income tax expense $ 73 $ 0
Canada    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Statutory tax rate 27.00% 27.00%