Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

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Income Taxes (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes (Textual) [Abstract]        
Federal net operating loss carryforwards, utilized $ 39,700,000      
Accrued interest and penalties on unrecognized tax benefits 0 0 0  
Option grant to non employees 8 years      
Net unrecognized tax benefits 0      
Approximate unrecognized tax benefits 200,000      
Effective income tax rate 300,000      
Increased unrecognized tax benefit 4,000,000      
Total gross unrecognized tax benefit 9,245,000 5,250,000 5,413,000 6,818,000
Maximum [Member]
       
Operating Loss Carryforwards [Line Items]        
Expiration Period 20 years      
Minimum [Member]
       
Operating Loss Carryforwards [Line Items]        
Expiration Period 15 years      
Research and Development Tax Credit Carryforwards [Member]
       
Operating Loss Carryforwards [Line Items]        
Research and development tax credit carryforwards 4,200,000      
Federal [Member]
       
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 201,800,000      
State [Member]
       
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 179,700,000      
Foreign [Member]
       
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards $ 13,600,000