CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total USD ($)	Advisory Board and Consultants USD ($)	Employees USD ($)	Common Stock USD ($)	Common Stock Employees	Additional Paid-in Capital USD ($)	Additional Paid-in Capital Advisory Board and Consultants USD ($)	Additional Paid-in Capital Employees USD ($)	Accumulated Deficit USD ($)
Beginning Balance at Dec. 31, 2008	$ 51,290			$ 17		$ 166,172			$ (114,899)
Beginning Balance (in shares) at Dec. 31, 2008				171,715,514
Issuance of common stock under employee stock purchase plan (in shares)				210,048
Issuance of common stock under employee stock purchase plan	118					118
Exercise of stock options, net of 58,474 shares tendered in payment of exercise price in 2011 (in shares)				512,875
Exercise of stock options, net of 58,474 shares tendered in payment of exercise price in 2011	242					242
Stock-based compensation (in shares)					1
Stock-based compensation		550	6,984				550	6,984
Repurchase and retirement of common stock (in shares)				(4,531,400)
Repurchase and retirement of common stock	(2,717)					(2,717)
Net income (loss)	(18,673)								(18,673)
Ending Balance at Dec. 31, 2009	37,794			17		171,349			(133,572)
Ending Balance (in shares) at Dec. 31, 2009				167,907,038
Issuance of common stock in private equity offering, net of expenses of $122 (in shares)				14,050,000
Issuance of common stock in private equity offering, net of expenses of $122	13,928			1		13,927
Issuance of common stock under employee stock purchase plan (in shares)				62,274
Issuance of common stock under employee stock purchase plan	63					63
Exercise of stock options, net of 58,474 shares tendered in payment of exercise price in 2011 (in shares)				1,345,050
Exercise of stock options, net of 58,474 shares tendered in payment of exercise price in 2011	710					710
Issuance of restricted stock grants (net of 2,500 shares forfeited)				197,500
Stock-based compensation		49	5,390				49	5,390
Repurchase and retirement of common stock (in shares)				(65,370)
Repurchase and retirement of common stock	(64)					(64)
Net income (loss)	(10,951)								(10,951)
Ending Balance at Dec. 31, 2010	46,919			18		191,424			(144,523)
Ending Balance (in shares) at Dec. 31, 2010				183,496,492
Issuance of common stock under employee stock purchase plan (in shares)				58,884
Issuance of common stock under employee stock purchase plan	83					83
Exercise of stock options, net of 58,474 shares tendered in payment of exercise price in 2011 (in shares)				626,298
Exercise of stock options, net of 58,474 shares tendered in payment of exercise price in 2011	473					473
Exercise of warrants (in shares)				132,500
Exercise of warrants	126					126
Stock-based compensation		688	3,266				688	3,266
Cancelation of restricted stock(in shares)				(5,000)
Cancelation of restricted stock	60					60
Repurchase and retirement of common stock (in shares)				(1,056,106)
Repurchase and retirement of common stock	(1,493)					(1,493)
Warrants issued to lenders	9,428					9,428
Net income (loss)	3,893								3,893
Ending Balance at Dec. 31, 2011	$ 63,443			$ 18		$ 204,055			$ (140,630)
Ending Balance (in shares) at Dec. 31, 2011				183,253,068