Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue	$ 801	$ 1,053	$ 1,840	$ 2,322
Cost of goods sold	921	3,889	1,853	6,739
Gross loss	(120)	(2,836)	(13)	(4,417)
Operating expenses:
General and administrative	692	1,299	1,314	3,110
Sales and marketing	106	194	225	438
Research and development	42	195	75	836
(Gain) loss on disposal of assets	(1,052)	432	(1,614)	1,181
Asset impairment charge		675		675
Income (loss) from operations	92	(5,631)	(13)	(10,657)
Other income:
Interest income	80	28	138	34
Realized gain (loss) on foreign currency translation	(16)	13	(2)	19
Total other income	64	41	136	53
Income (loss) before income taxes	156	(5,590)	123	(10,604)
Income tax expense	(6)	(17)	(13)	(78)
Net income (loss)	$ 150	$ (5,607)	$ 110	$ (10,682)
Net income (loss) per common share
Basic	$ 0.05	$ (2.16)	$ 0.04	$ (4.04)
Diluted	$ 0.05	$ (2.16)	$ 0.04	$ (4.04)
Weighted average common shares outstanding used in computing net income (loss) per common share
Basic	2,733,202	2,608,814	2,732,285	2,641,144
Diluted	2,739,198	2,608,814	2,735,283	2,641,144