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Significant Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Reserves and accruals $ 176 $ 568
Total gross deferred tax assets 176 568
Deferred tax liabilities:    
Prepaid expenses and other (988) (132)
Depreciation and amortization (12,427) (15,480)
Total gross deferred tax liabilities (13,415) (15,612)
Noncurrent deferred tax liabilities, net $ (13,239) $ (15,044)