CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Warrants to acquire Common Stock [Member]	Accumulated Deficit [Member]
BALANCE at Dec. 31, 2009	$ 38,637	$ 174,027	$ 1,821	$ (137,211)
BALANCE (in shares) at Dec. 31, 2009	90,390	90,390
Net income (loss)	(5,913)			(5,913)
Net proceeds from common stock and warrant offering	4,969	4,969
Net proceeds from common stock and warrant offering (in shares)		3,243
Reclassification of warrants from current liability to equity	17,946		17,946
Stock option exercises	18	18
Stock option exercises (in shares)		11
Employee stock purchase plan issuances	119	119
Employee stock purchase plan issuances (in shares)		47
Amortization of deferred compensation related to restricted stock awards	42	42
Amortization of deferred compensation related to restricted stock awards (in shares)		17
Stock-based compensation expense	1,263	1,263
BALANCE at Jun. 30, 2010	57,081	180,438	19,767	(143,124)
BALANCE (in shares) at Jun. 30, 2010	93,708	93,708
BALANCE at Dec. 31, 2010	86,752	182,466	19,673	(115,387)
BALANCE (in shares) at Dec. 31, 2010	93,975,334	93,975,334
Net income (loss)	23,756			23,756
Net proceeds from common stock and warrant offering	1,727	3,454	(1,727)
Net proceeds from common stock and warrant offering (in shares)		365
Stock option exercises	282	282
Stock option exercises (in shares)		152
Employee stock purchase plan issuances	220	220
Employee stock purchase plan issuances (in shares)		129
Amortization of deferred compensation related to restricted stock awards	9	9
Amortization of deferred compensation related to restricted stock awards (in shares)		3
Equity portion of convertible notes offering	20,566	20,566
Stock-based compensation expense	2,485	2,485
BALANCE at Jun. 30, 2011	$ 135,797	$ 209,482	$ 17,946	$ (91,631)
BALANCE (in shares) at Jun. 30, 2011	94,624,138	94,624,138