Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data, 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, 2009	$ 66,351	$ 49	$ 303,841	$ (3,439)	$ (234,100)
Beginning balance, shares at at Dec. 31, 2009		48,952,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued in connection with acquisition, shares		4,759,000
Shares issued in connection with acquisition	8,132	5	8,127
Common stock issued (canceled) under stock plans, shares		2,242,000
Common stock issued (canceled) under stock plans	288	2	286
Share-based compensation	3,003		3,003
Foreign currency translation adjustment	(145)			(145)
Net loss	(13,251)				(13,251)
Ending balance at at Dec. 31, 2010	64,378	56	315,257	(3,584)	(247,351)
Ending balance, shares at at Dec. 31, 2010		55,953,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of warrant to customer	1,007		1,007
Shares issued in connection with acquisition	0
Common stock issued (canceled) under stock plans, shares		1,746,000
Common stock issued (canceled) under stock plans	1,028	2	1,026
Share-based compensation	4,379		4,379
Excess tax benefit	12		12
Foreign currency translation adjustment	(78)			(78)
Net loss	(22,024)				(22,024)
Ending balance at at Dec. 31, 2011	48,702	58	321,681	(3,662)	(269,375)
Ending balance, shares at at Dec. 31, 2011	57,699,000	57,699,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued in connection with acquisition	0
Common stock issued (canceled) under stock plans, shares		(253,000)
Common stock issued (canceled) under stock plans	166	0	166
Common stock issued under bonus plans, shares		819,000
Common stock issued under bonus plans	1,005		1,005
Share-based compensation	3,723		3,723
Foreign currency translation adjustment	129			129
Net 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	58,265,000	58,265,000