SEGMENT INFORMATION - Operating Information by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 14,948	$ 19,328
Total income from operations for reportable segments	(1,448)	(2,709)
Other income, net	93	432
Loss before income taxes	(1,355)	(2,277)
Operating segments
Segment Reporting Information [Line Items]
Total income from operations for reportable segments	1,150	486
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Total income from operations for reportable segments	(2,598)	(3,195)
Primary Reporting Segment
Segment Reporting Information [Line Items]
Net sales	14,008	18,054
Primary Reporting Segment | Operating segments
Segment Reporting Information [Line Items]
Total income from operations for reportable segments	1,315	822
China
Segment Reporting Information [Line Items]
Net sales	698	1,056
China | Operating segments
Segment Reporting Information [Line Items]
Total income from operations for reportable segments	(83)	(311)
Russia and Kazakhstan
Segment Reporting Information [Line Items]
Net sales	242	218
Russia and Kazakhstan | Operating segments
Segment Reporting Information [Line Items]
Total income from operations for reportable segments	$ (82)	$ (25)