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Income Taxes (Components of Net Deferred Tax Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
In-process research and development not subject to future amortization for tax purposes | $ 5,661 | $ 5,418
Gross deferred tax liability | $ 5,661 | $ 5,418

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