Consolidated Statements Of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2008	$ 46	$ 300,555	$ (3,474)	$ (220,475)	$ 76,652
Balance, shares at Dec. 31, 2008	46,308
Common stock issued under stock plans	3	464			467
Common stock issued under stock plans, shares	2,644
Share-based compensation expense		2,822			2,822
Foreign currency translation adjustment			35		35
Net loss				(13,625)	(13,625)
Balance at Dec. 31, 2009	49	303,841	(3,439)	(234,100)	66,351
Balance, shares at Dec. 31, 2009	48,952
Shares issued in connection with acquisition	5	8,127			8,132
Shares issued in connection with acquisition, shares	4,759
Common stock issued under stock plans	2	286			288
Common stock issued under stock plans, shares	2,242
Share-based compensation expense		3,003			3,003
Foreign currency translation adjustment			(145)		(145)
Net loss				(13,251)	(13,251)
Balance at Dec. 31, 2010	56	315,257	(3,584)	(247,351)	64,378
Balance, shares at Dec. 31, 2010	55,953				55,953
Issuance of warrant to customer		1,007			1,007
Common stock issued under stock plans	2	1,026			1,028
Common stock issued under stock plans, shares	1,746
Share-based compensation expense		4,379			4,379
Excess tax benefit		12			12
Foreign currency translation adjustment			(78)		(78)
Net loss				(22,024)	(22,024)
Balance at Dec. 31, 2011	$ 58	$ 321,681	$ (3,662)	$ (269,375)	$ 48,702
Balance, shares at Dec. 31, 2011	57,699				57,699