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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - TRS [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Expense Benefit [Line Items]    
Deferred tax assets $ 29,857 $ 37,940
Deferred tax liabilities (11) (72)
Valuation allowance (29,846) (37,868)
Net deferred tax asset $ 0 $ 0