Warrant Liability (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Mar. 28, 2012
Number of securities called by warrants issued						2,505,852
Warrants issued, exercise price						$ 1.82
Warrant liability	$ 1,012,000		$ 1,012,000		$ 2,080,000
Interest and other income (expense), net	1,030,000	(5,000)	1,095,000	10,000
Warrant [Member]
Interest and other income (expense), net	$ (1,068,000)		$ (1,356,000)