Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Treasury Stock	Accumulated Deficit
Beginning Balance, Stockholders' Equity at Dec. 31, 2009	$ 94,706	$ 54	$ 631,785	$ 22,014	$ (37,986)	$ (521,161)
Beginnng Balance, Shares, Outstanding at Dec. 31, 2009		54,140,000			(4,181,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(33,403)					(33,403)
Other comprehensive loss, net of tax	(1,807)			(1,807)
Shares issued under employee stock plan, net, shares		196,000
Shares issued under employee stock plan, net,, value	84		84
Shares issued under employee stock purchase plan, shares		104,000
Shares issued under employee stock purchase plan, value	331		331
Stock-based Compensation	2,744		2,744
Ending Balance, Stockholders' Equity at Dec. 31, 2010	62,655	54	634,944	20,207	(37,986)	(554,564)
Ending Balance, Shares, Outstanding at Dec. 31, 2010		54,440,000			(4,181,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(17,950)					(17,950)
Other comprehensive loss, net of tax	265			265
Shares issued in connection with public offering, net, shares		7,820,000
Shares issued in connection with public offering, net, value	12,599	9	12,590
Shares issued under employee stock plan, net, shares		144,000
Shares issued under employee stock plan, net,, value	87		87
Shares issued under employee stock purchase plan, shares		143,000
Shares issued under employee stock purchase plan, value	185		185
Stock-based Compensation	2,304		2,304
Ending Balance, Stockholders' Equity at Dec. 31, 2011	60,145	63	650,110	20,472	(37,986)	(572,514)
Ending Balance, Shares, Outstanding at Dec. 31, 2011		62,547,000			(4,181,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(19,319)					(19,319)
Other comprehensive loss, net of tax	535			535
Shares issued under employee stock plan, net, shares		256,000
Shares issued under employee stock plan, net,, value	238		238
Shares issued under employee stock purchase plan, shares		105,000
Shares issued under employee stock purchase plan, value	128		128
Stock-based Compensation	1,565		1,565
Ending Balance, Stockholders' Equity at Dec. 31, 2012	$ 43,292	$ 63	$ 652,041	$ 21,007	$ (37,986)	$ (591,833)
Ending Balance, Shares, Outstanding at Dec. 31, 2012		62,908,000			(4,181,000)