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, 2015	$ 5,981	$ 17,721	$ (3,171)	$ (721)	$ (38)	$ 19,772
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
Shares issued under the ESPP	$ 18	93				111
Shares issued under the ESPP, shares	18
Stock-based compensation		685				685
Net income (loss)			(4,943)		(157)	(5,100)
Investment by non-controlling interest					650	650
Comprehensive loss				(293)		(293)
Balance at Dec. 31, 2016	$ 6,820	21,383	(8,114)	(1,014)	455	19,530
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)			2,058		(938)	1,120
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	(6,056)	(733)	(253)	21,439
Balance, shares at Dec. 31, 2017	6,900
Exercise of stock options	$ 532	(23)				$ 509
Exercise of stock options, shares	532					600
Shares issued from equity offering	$ 1,725	87,242				$ 88,967
Shares issued from equity offering, shares	1,725
Repurchase of director and executive shares	$ (500)	(25,407)				(25,907)
Repurchase of director and executive shares, shares	(500)
Shares issued under the ESPP	$ 7	211				218
Shares issued under the ESPP, shares	7
Stock-based compensation		1,395				1,395
Net income (loss)			5,547			5,547
Comprehensive loss				(194)		(194)
Balance at Dec. 31, 2018	$ 8,664	$ 84,999	$ (509)	$ (927)	$ (253)	$ 91,974
Balance, shares at Dec. 31, 2018	8,664