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Income taxes - Income Tax Expense Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Loss before income taxes $ (55,285) $ (23,111)
Basic income tax rate 26.30% 26.67%
Computed income tax recovery $ (14,542) $ (6,164)
Accounting charges not deductible for tax purposes 23 12
Non-deductible share-based compensation 317 169
Unrecorded potential tax benefits of current period losses and other tax assets 16,829 6,183
Non-refundable investment tax credit used (earned) in the year   (145)
Share issue costs (2,739)  
Valuation allowance adjustment for prior year 77  
Other (21) 19
Income tax expense reported in the consolidated statements of loss and comprehensive loss (56) 74
Scientific research and experimental development expenditures 41,985 $ 16,849
Canada Federal    
NOL Carry Forwards 86,591  
Scientific research and experimental development expenditures 9,377  
Quebec    
NOL Carry Forwards 86,085  
Scientific research and experimental development expenditures 11,127  
United States    
NOL Carry Forwards $ 12,439