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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Capitalized research and development costs $ 59,426,000 $ 53,824,000
Net operating losses 56,906,000 53,687,000
Research and development credits 8,931,000 7,777,000
Accrued wind down cost   292,000
Stock-based compensation 1,063,000 853,000
Capital loss carryover 541,000 544,000
Fixed assets 452,000 430,000
Other 1,289,000 1,002,000
Gross deferred tax assets 128,608,000 118,409,000
Valuation allowance (128,315,000) (118,045,000)
Total deferred tax assets 293,000 364,000
Deferred tax liability:    
Intangible assets (293,000) (364,000)
Total deferred tax liability (293,000) (364,000)
Net deferred tax assets $ 0