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Income Taxes - Balance Sheet Classifications of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Balance Sheet Classifications of Deferred Tax Assets and Liabilities [Abstract] |  |
Current assets | $ 0 | $ 239
Long-term assets (liabilities) | 0 | 992
Net deferred tax asset | $ 0 | $ 1,231

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