Consolidated Statements of Stockholders' Equity and Comp Loss (USD $) In Thousands	Common Stock and Additional Paid-In Capital	Accumulated Other Comprehensive Income	Treasury Stock	Accumulated Deficit	Total
Beginning balance, amount at Dec. 31, 2008	$ 628,686	$ 20,255	$ (37,986)	$ (454,119)	$ 156,836
Beginning balance, shares at Dec. 31, 2008	53,874		(4,181)
Net loss				(67,042)	(67,042)
Cumulative translation adjustments		1,665			1,665
Unrealized gain on investments		94			94
Comprehensive loss					(65,283)
Shares issued under employee stock plans, amount	8				8
Shares issued under employee stock plans, shares	83
Shares issued under employee stock purchase plan, amount	201				201
Shares issued under employee stock purchase plan, shares	183
Stock-based compensation expense	2,944				2,994
Ending balance, amount at Dec. 31, 2009	631,839	22,014	(37,986)	(521,161)	94,706
Ending balance, shares at Dec. 31, 2009	54,140		(4,181)
Net loss				(33,403)	(33,403)
Cumulative translation adjustments		(1,815)			(1,815)
Unrealized gain on investments		8			8
Comprehensive loss					(35,210)
Shares issued under employee stock plans, amount	84				84
Shares issued under employee stock plans, shares	196
Shares issued under employee stock purchase plan, amount	331				331
Shares issued under employee stock purchase plan, shares	104
Stock-based compensation expense	2,744				2,744
Ending balance, amount at Dec. 31, 2010	634,998	20,207	(37,986)	(554,564)	62,655
Ending balance, shares at Dec. 31, 2010	54,440		(4,181)
Net loss				(17,950)	(17,950)
Cumulative translation adjustments		158			158
Unrealized gain on investments		107			107
Comprehensive loss					(17,685)
Shares issued in connection with public offering, net, amount	12,599				12,599
Shares issued in connection with public offering, net, shares	7,820
Shares issued under employee stock plans, amount	87				87
Shares issued under employee stock plans, shares	144
Shares issued under employee stock purchase plan, amount	185				185
Shares issued under employee stock purchase plan, shares	143
Stock-based compensation expense	2,304				2,304
Ending balance, amount at Dec. 31, 2011	$ 650,173	$ 20,472	$ (37,986)	$ (572,514)	$ 60,145
Ending balance, shares at Dec. 31, 2011	62,547		(4,181)