Basis of Presentation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Basis of Presentation (Additional Textual) [Abstract]
Amount paid upon exercise of redemption rights	$ 5,667	$ 5,116
Accumulated deficit	(444,261)	(439,629)
Cash and cash equivalents	$ 3,363	$ 5,040	$ 5,502	$ 6,866
Securities Purchase Agreement date	May 24, 2010
Number of trading days	3 days
Common stock, par value	$ 0.0001
Percentage of issued and outstanding common stock	9.999%
Asset Purchase Agreement Date	January 19 2013
Series of C-12 stock , Period of business days	10 days
Maximum [Member]
Basis of Presentation (Textual) [Abstract]
Conversion Cap of Preferred Stock	3.76%
Minimum [Member]
Basis of Presentation (Textual) [Abstract]
Conversion Cap of Preferred Stock	0.00%
Series C-1 Preferred Stock [Member]
Basis of Presentation (Textual) [Abstract]
Number of shares possibly redeemable that is equal to or lesser than Series C-1	2,900