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Income Taxes (Details 2) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Capitalized research expense $ 1,201,000 $ 2,059,000
Net operating loss carryforwards 71,848,000 64,354,000
Research and development and other tax credits 3,339,000 2,417,000
Deferred revenue 5,213,000 1,828,000
Deferred rent 2,171,000 1,878,000
Stock-based compensation 2,135,000 2,704,000
Other 3,457,000 3,251,000
Deferred Tax Assets, Gross 89,364,000 78,491,000
Valuation allowance (83,245,000) (75,363,000)
Total deferred tax assets 6,119,000 3,128,000
Deferred tax liabilities:    
Acquired intangibles (596,000) (804,000)
Investment in affiliated entity (4,399,000) (1,315,000)
Fixed assets (1,299,000) (1,170,000)
Net deferred tax liabilities $ (175,000) $ (161,000)