Income Taxes (Details Textual) (USD $)	12 Months Ended				12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2010 Research [Member]	Dec. 31, 2012 Domestic Tax Authority [Member]	Dec. 31, 2011 State and Local Jurisdiction [Member]	Dec. 31, 2012 California [Member] State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Operating loss carry-forwards					$ 205,243,000		$ 39,246,000
Tax credits related to federal and state research and development				733,000	2,190,000	602,000
Expiry year of operating loss carry-forwards					2020		2017
Expiry year of operating loss carry-forwards related to federal and state research and development activities	2021
Income Taxes (Textual) [Abstract]
Decrease in valuation allowance	195,000	2,854,000
Recorded capital loss carryover			4,000,000
Deferred tax asset	1,593,000	1,490,000	1,360,000
Unrecognized tax benefits	673,880
Accrued interest and penalties related to uncertain tax	$ 0