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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
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