Condensed Consolidated Statements Of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
BALANCE - value at Dec. 31, 2015	$ 252,173	$ 6	$ (1,433)	$ 283,247	$ (27,664)	$ (1,983)
BALANCE - shares at Dec. 31, 2015		60,709	(278)
Share-based compensation, value	927			927
Share-based compensation, shares		81
Exercise of options and purchases from employee stock plans, value	415			415
Exercise of options and purchases from employee stock plans, shares		144
Net loss	(4,035)				(4,035)
Other comprehensive Income (loss)—net of tax	409					409
BALANCE - value at Mar. 31, 2016	249,889	$ 6	$ (1,433)	284,589	(31,699)	(1,574)
BALANCE - shares at Mar. 31, 2016		60,934	(278)
BALANCE - value at Dec. 31, 2016	247,890	$ 6	$ (1,433)	286,303	(35,841)	(1,145)
BALANCE - shares at Dec. 31, 2016		61,240	(278)
Share-based compensation, value	918			918
Share-based compensation, shares		109
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(164)			(164)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		69
Exercise of options and purchases from employee stock plans, value	434			434
Exercise of options and purchases from employee stock plans, shares		132
Net loss	(16,788)				(16,788)
Other comprehensive Income (loss)—net of tax	(762)					(762)
BALANCE - value at Mar. 31, 2017	$ 231,528	$ 6	$ (1,433)	$ 287,491	$ (52,629)	$ (1,907)
BALANCE - shares at Mar. 31, 2017		61,550	(278)