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Company's Deferred Tax Assets, Net of Deferred Tax Liabilities and Valuation Allowance (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Deferred tax assets, net of deferred tax liabilities $ 16,393 $ 12,242
Valuation allowance (832) (832)
Deferred tax assets, net of deferred tax liabilities and valuation allowance $ 15,561 $ 11,410