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Income Taxes - Reconciliation of Income Tax Provision Computed at Statutory Rates (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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