Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Gain (Loss)	Treasury Stock
Balance, value at Dec. 31, 2010	$ 247,024	$ 338	$ 920,324	$ (673,406)	$ 5	$ (237)
Balance, shares at Dec. 31, 2010		337,566
Stock-based compensation	2,922	0	2,922	0	0	0
Issuance of common stock under Equity Incentive Plans, shares		329
Issuance of common stock under Equity Incentive Plans, value	551	0	551	0	0	0
Other	0
Repurchase of common stock	(108)	0	0	0	0	(108)
Net loss	(56,267)	0	0	(56,267)	0	0
Unrealized gain (loss) on investments	66	0	0	0	66	0
Balance, value at Jun. 30, 2011	194,188	338	923,797	(729,673)	71	(345)
Balance, shares at Jun. 30, 2011		337,895
Balance, value at Dec. 31, 2011	297,568	480	1,087,033	(789,621)	21	(345)
Balance, shares at Dec. 31, 2011		480,389
Stock-based compensation	3,313	0	3,313	0	0	0
Issuance of common stock under Equity Incentive Plans, shares		779
Issuance of common stock under Equity Incentive Plans, value	276	1	275	0	0	0
Other	(136)	0	(136)	0	0	0
Repurchase of common stock	(285)	0	0	0	0	(285)
Net loss	(55,799)	0	0	(55,799)	0	0
Unrealized gain (loss) on investments	(41)	0	0	0	(41)	0
Balance, value at Jun. 30, 2012	$ 244,896	$ 481	$ 1,090,485	$ (845,420)	$ (20)	$ (630)
Balance, shares at Jun. 30, 2012		481,168