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Income taxes - Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income taxes    
Net operating loss carry-forwards $ 25,965 $ 12,209
Tax basis of property and equipment in excess of carrying values 103 93
Federal SR&ED investment tax credits 535 273
Taxation of federal SR&ED investment tax credits (142) (72)
Research and development expenditures 2,686 1,791
Financing costs 2,103 138
Others 16 21
Total gross deferred tax assets 31,266 14,453
Valuation allowance $ (31,266) $ (14,453)