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Income Taxes (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Business Acquisition [Line Items]      
U.S - based valuation allowance $ 63,881,000 $ 36,395,000  
Federal net operating loss carryforwards expire 2026 through 2032    
Income Taxes (Textual) [Abstract]      
Valuation allowance related to its U.S based deferred taxes 27,500,000 14,600,000 3,100,000
Research and Development Tax Credits 614,000    
Valuation allowance prior to 2010 14,800,000    
Deferred income tax expense related to the changes in the valuation allowances on deferred tax assets 508,000 1,199,000 11,441,000
Statutory federal income tax rate 34.00% 34.00% 34.00%
Uncertain income tax position unrecognized Less than a 50% likelihood    
Settlements and lapses in statutes of limitations (50,000) (9,490,000) 0
Associated interest due to expiration of the applicable statutes of limitations for certain tax years 5,000 2,300,000  
Total liability for unrecognized tax benefits included other long-term liabilities 400,000 400,000  
Recognized tax benefits that would affect the effective tax rate 100,000    
Interest and penalties related to unrecognized tax benefits in the provision for income taxes 200,000 200,000  
Expected unrecognized tax benefits due to expiration of limitations applicable to the 2008 taxable year 71,000    
State and Local Jurisdiction [Member]
      
Business Acquisition [Line Items]      
U.S. federal net operating loss carryforwards 91,200,000    
Foreign Country [Member]
      
Business Acquisition [Line Items]      
U.S - based valuation allowance 5,000,000 4,300,000  
U.S. federal net operating loss carryforwards 26,400,000    
Federal net operating loss carryforwards expire 2014 through 2033    
California research and development tax credit carryforwards 6,100,000    
Domestic Country [Member]
      
Business Acquisition [Line Items]      
U.S - based valuation allowance 58,900,000 32,100,000  
Federal net operating loss carryforwards expire 2027 through 2031    
California research and development tax credit carryforwards $ 3,000,000