Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 1,934	$ 1,456	$ 5,885	$ 4,002
Cost of sales	1,377	1,162	4,490	3,204
Gross margin	557	294	1,395	798
Operating expenses:
Selling and marketing	98	127	289	391
General and administrative	1,390	1,125	3,599	3,117
Total operating expenses	1,488	1,252	3,888	3,508
Loss from continuing operations	(931)	(958)	(2,493)	(2,710)
Net equity income from foreign joint ventures’ operations:
Equity income from foreign joint ventures’ operations	251	98	706	284
Foreign joint ventures’ operations related expenses	(32)	(68)	(142)	(195)
Net equity income from foreign joint ventures’ operations	219	30	564	89
Income (loss) from continuing operations and net equity income from foreign joint ventures’ operations	(712)	(928)	(1,929)	(2,621)
Other income (expense):
Interest expense and other, net	16	11	85	29
Income (loss) from continuing operations before income taxes	(696)	(917)	(1,844)	(2,592)
Provision for (benefit from) income taxes on continuing operations	128	11	318	(84)
Net income (loss) from continuing operations	(824)	(928)	(2,162)	(2,508)
Income (loss) from discontinued operations, including gain on sale of $6,279 during the three months ended September 30, 2018	4,413	(112)	848	(2,086)
Net income (loss) from discontinued operations	4,413	(112)	848	(2,086)
Net income (loss) before dividends on redeemable convertible preferred stock	3,589	(1,040)	(1,314)	(4,594)
Dividends on redeemable convertible preferred stock	(90)	(89)	(270)	(267)
Net income (loss) attributable to common stockholders	$ 3,499	$ (1,129)	$ (1,584)	$ (4,861)
Earnings (loss) per common share - basic:
Continuing operations	$ (0.10)	$ (0.12)	$ (0.28)	$ (0.33)
Discontinued operations	0.49	(0.01)	0.10	(0.24)
Consolidated operations	0.39	(0.13)	(0.18)	(0.57)
Earnings (loss) per common share - diluted:
Continuing operations	(0.08)	(0.12)	(0.28)	(0.33)
Discontinued operations	0.40	(0.01)	0.10	(0.24)
Consolidated operations	$ 0.32	$ (0.13)	$ (0.18)	$ (0.57)