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Income Taxes (Details 1) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Capitalized research and development costs $ 53,824,000 $ 53,565,000
Net operating losses 53,687,000 53,065,000
Research and development credits 7,777,000 8,038,000
Accrued wind down cost 292,000 630,000
Stock-based compensation 853,000 512,000
Capital loss carryover 544,000 596,000
Fixed assets 430,000 458,000
Other 1,002,000 731,000
Gross Deferred Tax assets 118,409,000 117,595,000
Valuation allowance (118,045,000) (117,181,000)
Total deferred tax assets 364,000 414,000
Deferred tax liability:    
Intangible assets (364,000) (414,000)
Total deferred tax liability (364,000) (414,000)
Net deferred tax assets