Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Beginning balance at at Dec. 31, 2011	$ 48,702	$ 58	$ 321,681	$ (3,662)	$ (269,375)
Beginning balance, shares at at Dec. 31, 2011		57,699
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (canceled) under stock plans, shares		(253)
Common stock issued (canceled) under stock plans	166	0	166
Common stock issued under bonus plans, shares		819
Common stock issued under bonus plans	1,005	0	1,005
Share-based compensation expense	3,723		3,723
Foreign currency translation adjustment	129			129
Net income (loss)	(14,950)				(14,950)
Ending balance at at Dec. 31, 2012	38,775	58	326,575	(3,533)	(284,325)
Ending balance, shares at at Dec. 31, 2012		58,265
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (canceled) under stock plans, shares		873
Common stock issued (canceled) under stock plans	839	1	838
Share-based compensation expense	2,690		2,690
Foreign currency translation adjustment	279			279
Net income (loss)	5,064				5,064
Ending balance at at Dec. 31, 2013	47,647	59	330,103	(3,254)	(279,261)
Ending balance, shares at at Dec. 31, 2013	59,138	59,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (canceled) under stock plans, shares		1,639
Common stock issued (canceled) under stock plans	3,581	2	3,579
Share-based compensation expense	3,145		3,145
Foreign currency translation adjustment	102			102
Net income (loss)	8,055				8,055
Ending balance at at Dec. 31, 2014	$ 62,530	$ 61	$ 336,827	$ (3,152)	$ (271,206)
Ending balance, shares at at Dec. 31, 2014	60,777	60,777