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	1,472	0	1,472	0	0	0
Issuance of common stock under Equity Incentive Plans, shares		309
Issuance of common stock under Equity Incentive Plans, value	523	0	523	0	0	0
Other	0
Repurchase of common stock	(108)	0	0	0	0	(108)
Net loss	(29,629)	0	0	(29,629)	0	0
Unrealized gain (loss) on investments	35	0	0	0	35	0
Balance, value at Mar. 31, 2011	219,317	338	922,319	(703,035)	40	(345)
Balance, shares at Mar. 31, 2011		337,875
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	1,718	0	1,718	0	0	0
Issuance of common stock under Equity Incentive Plans, shares		553
Issuance of common stock under Equity Incentive Plans, value	52	1	51	0	0	0
Other	(136)	0	(136)	0	0	0
Repurchase of common stock	(285)	0	0	0	0	(285)
Net loss	(29,868)	0	0	(29,868)	0	0
Unrealized gain (loss) on investments	(78)	0	0	0	(78)	0
Balance, value at Mar. 31, 2012	$ 268,971	$ 481	$ 1,088,666	$ (819,489)	$ (57)	$ (630)
Balance, shares at Mar. 31, 2012		480,942