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Income Taxes - Reconciliation of Income Tax Provision Computed at Statutory Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	34.00%
Net loss before income taxes	$ 28,623	$ 28,024
Expected income tax recovery	(6,011)	(9,528)
Increase (decrease) in income tax recovery resulting from:
Derivative liability	877	1,171
Share based payments	1,279	453
Other permanent difference	(376)	(446)
Effect of change in statutory rate		5,938
State deferred change		(2,050)
Foreign income taxed at foreign rate	23	118
Increase in valuation allowance	$ 4,208	$ 4,344

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