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Income Taxes (Components of Net Deferred Tax Assets) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 33,539 | $ 23,632
Tax credit carryforwards | 3,549 | 3,201
Unrealized gain on marketable securities | 0 | (1,052)
Stock based compensation | 8,322 | 7,944
Other | 12 | (328)
Licensing deduction deferral | 8,682 | 8,194
Gross deferred tax assets | 54,104 | 41,591
Valuation allowance | (54,104) | (41,591)
Net deferred tax asset | $ 0 | $ 0

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