CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance, beginning at Dec. 31, 2010	$ 51,308	$ 43	$ 453,353	$ (399,055)	$ (292)	$ (2,741)
Balance, beginning (in shares) at Dec. 31, 2010		33,326				(200)
Net loss	(22,927)			(22,927)
Compensation expenses for share-based payment arrangements	1,495		1,495
Issuance of restricted stock, net of forfeitures (in shares)		(10)
Sale of common stock under employee stock purchase plans and exercise of stock options (in shares)		283
Sale of common stock under employee stock purchase plans and exercise of stock options	1,272	1	1,271
Balance, ending at Mar. 31, 2011	31,148	44	456,119	(421,982)	(292)	(2,741)
Balance, ending (in shares) at Mar. 31, 2011		33,599				(200)
Balance, beginning at Dec. 31, 2011	71,801	44	463,440	(388,674)	(268)	(2,741)
Balance, beginning (in shares) at Dec. 31, 2011		34,046				(200)
Net loss	(13,086)			(13,086)
Other comprehensive income	8				8
Compensation expenses for share-based payment arrangements	2,609		2,609
Sale of common stock under employee stock purchase plans and exercise of stock options (in shares)		16
Sale of common stock under employee stock purchase plans and exercise of stock options	82		82
Balance, ending at Mar. 31, 2012	$ 61,414	$ 44	$ 466,131	$ (401,760)	$ (260)	$ (2,741)
Balance, ending (in shares) at Mar. 31, 2012		34,062				(200)