Income Taxes (Detail Textuals) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense	$ 54,000	$ 16,667,000	$ 1,071,000	$ 16,670,000
Income tax U.S. statutory rate			34.00%
Tax benefits from such stock-based awards			488,000
Deferred tax assets	1,500,000		1,500,000
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			488,000
Income tax liability current		4,000,000		4,000,000
Non cash adjustment related to cumulative deduction for stock options in excess of book expense		12,700,000		12,700,000
Gain on sale of patent assets				$ 71,226,000