CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance at Dec. 31, 2008	$ 40	$ 422,085	$ (298,718)	$ (1,297)	$ (2,741)	$ 119,369
Balance (Shares) at Dec. 31, 2008	30,807				(200)
Comprehensive income (loss):
Net income (loss)			(30,612)			(30,612)
Net unrealized gain on marketable and auction rate securities				990		990
Total comprehensive income (loss):						(29,622)
Compensation expenses for share-based payment arrangements		12,986				12,986
Issuance of restricted stock, net of forfeitures (in shares)	266
Sale of common stock under employee stock purchase plans and exercise of stock options (in shares)	1,069
Sale of common stock under employee stock purchase plans and exercise of stock options	2	4,872				4,874
Balance at Dec. 31, 2009	42	439,943	(329,330)	(307)	(2,741)	107,607
Balance (Shares) at Dec. 31, 2009	32,142				(200)
Comprehensive income (loss):
Net income (loss)			(69,725)			(69,725)
Net unrealized gain on marketable and auction rate securities				15		15
Total comprehensive income (loss):						(69,710)
Compensation expenses for share-based payment arrangements		9,515				9,515
Issuance of restricted stock, net of forfeitures (in shares)	173
Sale of common stock under employee stock purchase plans and exercise of stock options (in shares)	1,011
Sale of common stock under employee stock purchase plans and exercise of stock options	1	3,895				3,896
Balance at Dec. 31, 2010	43	453,353	(399,055)	(292)	(2,741)	51,308
Balance (Shares) at Dec. 31, 2010	33,326				(200)
Comprehensive income (loss):
Net income (loss)			10,381			10,381
Net unrealized gain on auction rate securities				24		24
Total comprehensive income (loss):						10,405
Compensation expenses for share-based payment arrangements		6,362				6,362
Forefeitures of restricted stock (in shares)	(38)
Sale of common stock under employee stock purchase plans and exercise of stock options (in shares)	758
Sale of common stock under employee stock purchase plans and exercise of stock options	1	3,725				3,726
Balance at Dec. 31, 2011	$ 44	$ 463,440	$ (388,674)	$ (268)	$ (2,741)	$ 71,801
Balance (Shares) at Dec. 31, 2011	34,046				(200)