Consolidated Statements Of Stockholders' Deficit (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In-Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2008	$ 947	$ 148,384	$ (168,837)	$ (19,506)
Balance, shares at Dec. 31, 2008	94,681,618
Issuance of common stock from employee stock purchase plan		9		9
Issuance of common stock from employee stock purchase plan, shares	56,782
Stock-based compensation		619		619
Net loss			(14,155)	(14,155)
Balance at Dec. 31, 2009	947	149,012	(182,992)	(33,033)
Balance, shares at Dec. 31, 2009	94,738,400
Issuance of common stock from exercise of stock options	1	20		21
Issuance of common stock from exercise of stock options, shares	84,193
Stock-based compensation		385		385
Net loss			(9,593)	(9,593)
Balance at Dec. 31, 2010	948	149,417	(192,585)	(42,220)
Balance, shares at Dec. 31, 2010	94,822,593
Issuance of common stock from private placement, net of issuance costs	370	20,029		20,399
Issuance of common stock from private placement, net of issuance costs, shares	36,978,440
Issuance of common stock from exercise of stock options	2	56		58
Issuance of common stock from exercise of stock options, shares	150,000
Initial value of warrant liability		(6,356)		(6,356)
Stock-based compensation		522		522
Net loss			(6,942)	(6,942)
Balance at Dec. 31, 2011	$ 1,320	$ 163,668	$ (199,527)	$ (34,539)
Balance, shares at Dec. 31, 2011	131,951,033