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Company's Deferred Tax Assets, Net of Deferred Tax Liabilities and Valuation Allowance (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Deferred tax assets, net of deferred tax liabilities $ 22,006 $ 18,786
Valuation allowance (1,507) (1,507)
Deferred tax assets, net of deferred tax liabilities and valuation allowance $ 20,499 $ 17,279