Consolidated Statements Of Changes In Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In-Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance at Dec. 31, 2008	$ 547	$ 214,467	$ (151,614)	$ 24	$ 63,424
Balance (in Shares) at Dec. 31, 2008	54,654,000
Net loss			(90,853)		(90,853)
Restricted stock grants	7	(7)
Restricted stock grants (in Shares)	723,000
Amortization of deferred compensation		2,661			2,661
Forfeiture of restricted stock grants	(5)	5
Forfeiture of restricted stock grants (in Shares)	(507,000)
Issuance of common stock	1	352			353
Issuance of common stock (in Shares)	81,000
ESPP compensation expense		82			82
Stock option compensation expense		3,983			3,983
Issuance of common stock for cash with underwritten public offering, net of expenses	50	61,316			61,366
Issuance of common stock for cash with underwritten public offering, net of expenses (in Shares)	4,945,000
Issuance of common stock for cash on registered direct offering, net of expenses	59	28,960			29,019
Issuance of common stock for cash on registered direct offering, net of expenses (in Shares)	5,927,000
Issuance of warrants in connection with registered direct offering, net of expenses		(12,561)			(12,561)
Exercise of stock options	10	6,736			6,746
Exercise of stock options (in Shares)	1,110,000
Other comprehensive loss				(21)	(21)
Balance at Dec. 31, 2009	669	305,994	(242,467)	3	64,199
Balance (in Shares) at Dec. 31, 2009	66,933,000
Net loss			(73,109)		(73,109)
Restricted stock grants	1				1
Restricted stock grants (in Shares)	69,000
Amortization of deferred compensation		4,374			4,374
Forfeiture of restricted stock grants (in Shares)	(6,000)
Shares repurchased and cancelled	(1)	(1,281)			(1,282)
Shares repurchased and cancelled (in Shares)	(80,000)
Issuance of common stock		326			326
Issuance of common stock (in Shares)	30,000
ESPP compensation expense		341			341
Stock option compensation expense		3,069			3,069
Warrant Exercise	31	49,516			49,547
Warrant Exercise (in Shares)	3,040,000
Exercise of stock options	3	1,800			1,803
Exercise of stock options (in Shares)	273,000
Other comprehensive loss				(2)	(2)
Balance at Dec. 31, 2010	703	364,139	(315,576)	1	49,267
Balance (in Shares) at Dec. 31, 2010	70,259,000
Net loss			(102,027)		(102,027)
Restricted stock grants	11	(11)
Restricted stock grants (in Shares)	1,174,000
Amortization of deferred compensation		3,317			3,317
Forfeiture of restricted stock grants		1			1
Forfeiture of restricted stock grants (in Shares)	(119,000)
Issuance of common stock	1	631			632
Issuance of common stock (in Shares)	155,000
ESPP compensation expense		795			795
Stock option compensation expense		3,788			3,788
Exercise of stock options		169			169
Exercise of stock options (in Shares)	33,000				33,000
Convertible Note conversion option, net of tax of $22,717		35,634			35,634
Other comprehensive loss				14	14
Balance at Dec. 31, 2011	$ 715	$ 408,463	$ (417,603)	$ 15	$ (8,410)
Balance (in Shares) at Dec. 31, 2011	71,502,000