Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Retained (Deficit) [Member]
BALANCE at Dec. 31, 2013	$ 68,586	$ 297	$ 211,852	$ (123,186)	$ (154)	$ (20,223)
BALANCE, Shares at Dec. 31, 2013		29,736,000		(18,687,000)
Issuance of common stock related to employee stock plans	1,900		(2,375)	$ 4,275
Issuance of common stock related to employee stock plans, Shares				534,000
Repurchases of common stock	(967)			$ (967)
Repurchases of common stock, Shares				(143,000)
Share-based compensation expense	1,512		1,512
Currency translation adjustment	(66)				(66)
Net (loss) income	4,064					4,064
BALANCE at Dec. 31, 2014	75,029	$ 297	210,989	$ (119,878)	(220)	(16,159)
BALANCE, Shares at Dec. 31, 2014		29,736,000		(18,296,000)
Issuance of common stock related to employee stock plans	1,488		(2,258)	$ 3,746
Issuance of common stock related to employee stock plans, Shares				468,000
Repurchases of common stock	$ (332)			$ (332)
Repurchases of common stock, Shares	(46,000)			(46,000)
Share-based compensation expense	$ 1,593		1,593
Currency translation adjustment	(334)				(334)
Net (loss) income	(4,060)					(4,060)
BALANCE at Dec. 31, 2015	73,384	$ 297	210,324	$ (116,464)	(554)	(20,219)
BALANCE, Shares at Dec. 31, 2015		29,736,000		(17,874,000)
Issuance of common stock related to employee stock plans	$ 3,964		(4,165)	$ 8,129
Issuance of common stock related to employee stock plans, Shares				1,016,000
Repurchases of common stock, Shares	0
Share-based compensation expense	$ 1,286		1,286
Currency translation adjustment	(26)				(26)
Net (loss) income	(2,834)					(2,834)
BALANCE at Dec. 31, 2016	$ 75,774	$ 297	$ 207,445	$ (108,335)	$ (580)	$ (23,053)
BALANCE, Shares at Dec. 31, 2016		29,736,000		(16,858,000)