Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (USD $) In Thousands	Total USD ($)	Series C-1 preferred USD ($)	Series C-1 convertible preferred stock USD ($)	Series C-2 convertible preferred stock USD ($)	Series C-1 Redeemable Convertible Preferred Stock USD ($)	Series C-1 Redeemable Convertible Preferred Stock Series C-1 preferred USD ($)	Series D-1 Convertible Preferred Stock USD ($)	Series D-1 Convertible Preferred Stock Series D-1 preferred USD ($)	Common Stock USD ($)	Common Stock Series C-1 preferred USD ($)	Common Stock Series D-1 preferred	Additional Paid-in Capital USD ($)	Additional Paid-in Capital Series C-1 preferred USD ($)	Additional Paid-in Capital Series D-1 preferred USD ($)	Accumulated Deficit USD ($)
Beginning Balance at Dec. 31, 2010	$ 482				$ 47							$ 428,563			$ (428,081)
Beginning Balance, shares at Dec. 31, 2010					6				9
Issuance of Series C-11 Preferred Stock dividends					58
Series C-11 Preferred Stock dividends	(197)				90							(197)
Conversion of Series Preferred Stock		904				(588)							904
Conversion of Series Preferred Stock, shares		588				(1)				865
Share-based compensation expense	254											254
Forfeit of Series C-11 Preferred Stock dividend	78				(5)							78
Adjustment to redemption value	(5,531)				5,531							(5,531)
Net income (loss)	(11,548)														(11,548)
Ending Balance at Dec. 31, 2011	(15,558)				5,133							424,071			(439,629)
Ending Balance, shares at Dec. 31, 2011					5				874
Issuance of Series C-11 Preferred Stock dividends	(780)				780							(780)
Issuance of Series C-11 Preferred Stock dividends, shares					1
Series C-11 Preferred Stock dividends	(56)				(90)							(56)
Conversion of Series Preferred Stock		31				(31)		(16)		1			30	16
Conversion of Series Preferred Stock, shares		31								6,358	3,347
Share-based compensation expense	8,604											8,604
Exercised Series C-2/D-1 warrants for Series C-2/D-1 Preferred Stock	500			500			4,631					(4,631)
Exercised Series C-2/D-1 warrants for Series C-2/D-1 Preferred Stock, shares				1			5
Issuance of restricted stock awards, shares									3,688
Removal of redemption and certain conversion features	18,210		5,792		(5,792)							12,418
Removal of redemption and certain conversion features, shares			(6)		(6)
Net income (loss)	(7,737)														(7,737)
Ending Balance at Dec. 31, 2012	$ 3,214		$ 5,792	$ 500			$ 4,615		$ 1			$ 439,672			$ (447,366)
Ending Balance, shares at Dec. 31, 2012			6	1			5		14,267