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Income Taxes (Components of Net Deferred Tax Assets) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 97,168 | $ 75,221
Tax credit carryforwards | 4,083 | 3,866
Stock based compensation | 5,757 | 5,050
Other | 58 | 1,430
Licensing deduction deferral | 10,263 | 9,910
Gross deferred tax assets | 117,329 | 95,477
Valuation allowance | (117,329) | (95,477)
Net deferred tax asset | $ 0 | $ 0

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