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Income Taxes - Deferred Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
U.S. |  |
Current income tax expense (benefit) | $ 0 | $ 0
Deferred income tax expense (benefit) | 0 | 0
Canada |  |
Current income tax expense (benefit) | 0 | 0
Deferred income tax expense (benefit) | 0 | 0
Other Foreign |  |
Deferred income tax expense (benefit) | $ 0 | $ 0

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