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Income Tax Expense - Components of Provision for (Recovery of) Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Major components of tax expense (income) [abstract]    
Current $ 431 $ 29
Deferred (2,906) 109
Provision for (recovery of) income taxes $ (2,475) $ 138