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Income Taxes - Schedule of Company's Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Net operating loss carryforwards $ 81,944 $ 73,129
Research and development tax credit carryforwards 7,996 6,770
Capitalized research    5
Stock-based compensation 7,927 7,375
Deferred Revenue 3,563   
Other 1,677 937
Total deferred tax asset 103,107 88,216
Valuation allowance (103,107) (88,216)
Net deferred tax assets      
Liabilities:    
Net deferred tax liability related to intangible assets (748)   
Total deferred tax liability $ (748)