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Income Taxes (Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Federal [Member]
Dec. 31, 2012
Federal [Member]
Dec. 31, 2011
California [Member]
Dec. 31, 2012
California [Member]
Dec. 31, 2012
Maximum [Member]
Federal [Member]
Dec. 31, 2012
Maximum [Member]
Research And Development Expense [Member]
Dec. 31, 2012
Maximum [Member]
California [Member]
Dec. 31, 2012
Minimum [Member]
Federal [Member]
Dec. 31, 2012
Minimum [Member]
Research And Development Expense [Member]
Dec. 31, 2012
Minimum [Member]
California [Member]
Income Tax Examination [Line Items]                          
Income tax provision (benefit) $ 107,000 $ 1,295,000 $ (72,000)                    
Prior year income taxes 100,000 600,000                      
Valuation allowance increased/decreased 6,800,000 (49,700,000) 25,200,000                    
Net operating loss carryforwards         1,007,000,000   880,000,000            
Operating loss carryforwards, expiration dates               2032 2029 2032 2018 2020 2013
Research and development tax credits       75,000,000   26,000,000              
Tax benefit of stock option 6,200,000                        
Unrecognized tax benefit would affect the effective tax rate 100,000 126,000 0                    
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 15,000 9,000                      
Unrecognized Tax Benefits, Interest on Income Taxes Expense 6,000 9,000                      
Accrued interest     0                    
Income Tax Reconciliation, State and Local Income Taxes $ 74,000 $ 660,000 $ 0