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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)

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