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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - TRS [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income Tax Expense Benefit [Line Items]    
Deferred tax assets $ 28,380 $ 29,857
Deferred tax liabilities (53) (11)
Valuation allowance (28,327) (29,846)
Net deferred tax asset $ 0 $ 0