Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data	Total	Series C-1 Redeemable Covertible Preferred Stock	Preferred stock	Common stock	Additional paid-in capital	Accumulated deficit
Balance at Dec. 31, 2009	$ 4,219	$ 0	$ 0	$ 7	$ 428,533	$ (424,321)
Balance, shares at Dec. 31, 2009		0	0	65,722,648
Issuance of common stock, net				2	(2)
Issuance of common stock, net, shares				28,970,435
Issuance of Series C-1 preferred stock for cash, shares		5,134
Issuance of Series C-1 preferred stock first right of negotiation		12
Issuance of Series C-1 preferred stock first right of negotiation, shares		50
Issuance of Series C-1 preferred stock dividends		35
Issuance of Series C-1 preferred stock dividends, shares		389
Issuance of common stock under Employee Stock Purchase Plan, shares				16,977
Share-based compensation expense	489				489
Series C-1 preferred stock dividends	(466)				(466)
Reverse stock split as of April 14, 2011 and February 20, 2012				(9)	9
Reverse stock split as of April 14, 2011 and February 20, 2012, shares				(93,762,959)
Net loss	(3,760)					(3,760)
Balance at Dec. 31, 2010	482	47	0	0	428,563	(428,081)
Balance, shares at Dec. 31, 2010		5,573	0	947,101
Issuance of Series C-1 preferred stock dividends		58
Issuance of Series C-1 preferred stock dividends, shares		58
Conversion of Series C-1 preferred stock	904	(588)		9	895
Conversion of Series C-1 preferred stock, shares		(588)		86,527,541
Share-based compensation expense	254				254
Series C-1 preferred stock dividends	(197)	90			(197)
Forfeit of Series C-1 preferred stock dividends	78	(5)			78
Reverse stock split as of April 14, 2011 and February 20, 2012				(9)	9
Reverse stock split as of April 14, 2011 and February 20, 2012, shares				(86,559,895)
Adjustment to redemption value	(5,531)	5,531			(5,531)
Net loss	(11,548)					(11,548)
Balance at Dec. 31, 2011	$ (15,558)	$ 5,133	$ 0	$ 0	$ 424,071	$ (439,629)
Balance, shares at Dec. 31, 2011		5,043	0	874,746