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Income Taxes (Details 2) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Capitalized research expense $ 3,191,000 $ 4,089,000
Net operating loss carry forwards 43,233,000 34,899,000
Research and development and other tax credits 1,134,000 1,073,000
Other 6,569,000 6,557,000
Deferred Tax Assets, Gross 54,127,000 46,618,000
Valuation allowance (52,185,000) (44,784,000)
Total deferred tax assets 1,942,000 1,834,000
Deferred tax liabilities:    
Acquired intangibles (1,532,000) (2,094,000)
Investment in affiliated entity (511,000) 181,000
Net deferred tax liabilities $ (101,000) $ (79,000)