Consolidated Statements Of Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Non-Controlling Interest [Member]	Total
Balance at Dec. 31, 2014	$ 5,844	$ 16,939	$ (6,274)	$ (402)		$ 16,107
Balance, shares at Dec. 31, 2014	5,844
Exercise of stock options	$ 123	112				$ 235
Exercise of stock options, shares	123					159
Shares issued under the ESPP	$ 14	91				$ 105
Shares issued under the ESPP, shares	14
Stock-based compensation		579				579
Net income (loss)			2,228		$ (111)	2,117
Investment by non-controlling interest					73	73
Comprehensive loss				(319)		(319)
Balance at Dec. 31, 2015	$ 5,981	17,721	(4,046)	(721)	(38)	18,897
Balance, shares at Dec. 31, 2015	5,981
Exercise of stock options	$ 16	11				$ 27
Exercise of stock options, shares	16					61
Shares issued from Equity Offering	$ 805	2,873				$ 3,678
Shares issued from Equity Offering, shares	805					805
Shares issued under the ESPP	$ 18	93				$ 111
Shares issued under the ESPP, shares	18
Stock-based compensation		685				685
Net income (loss)			(4,587)		(157)	(4,744)
Investment by non-controlling interest					650	650
Comprehensive loss				(293)		(293)
Balance at Dec. 31, 2016	$ 6,820	21,383	(8,633)	(1,014)	455	19,011
Balance, shares at Dec. 31, 2016	6,820
Exercise of stock options	$ 69	131				$ 200
Exercise of stock options, shares	69					220
Shares issued under the ESPP	$ 11	103				$ 114
Shares issued under the ESPP, shares	11
Stock-based compensation		844				844
Net income (loss)			1,802		(938)	864
Comprehensive loss				281		281
Acquisition of non-controlling interest					(650)	(650)
Allocation of non-controlling interest at acquisition (Note 4)		(880)			880
Balance at Dec. 31, 2017	$ 6,900	$ 21,581	$ (6,831)	$ (733)	$ (253)	$ 20,664
Balance, shares at Dec. 31, 2017	6,900