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Income Taxes (Detail Textuals) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Income Tax Disclosure [Abstract]          
Income tax expense $ (901,000) $ 6,578,000 $ 169,000 $ 23,248,000  
Income tax U.S. statutory rate     34.00%    
Tax benefit related to research tax credit       95,000  
Tax benefit related to a reduction in the estimate of tax expense       148,000  
Deferred tax assets 1,600,000   1,600,000    
Total deferred tax assets of federal research and development credit carryforwards         5,100,000
Total deferred tax assets of state research and development credit carryforwards         700,000
Equity adjustment to additional paid-in capital     63,000    
Gain on sale of patent assets       86,400,000  
Current income tax liability   7,500,000   7,500,000  
Non cash adjustment related to cumulative deduction for stock options in excess of book expense   $ 15,800,000   $ 15,800,000