Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue	$ 3,878	$ 5,044
Cost of goods sold	3,862	10,552
Gross profit (loss)	16	(5,508)
Operating expenses:
General and administrative	2,250	4,510
Sales and marketing	376	775
Research and development	122	962
Long-lived asset impairment charge		5,051
(Gain) loss on sale or disposal of assets	(3,367)	1,118
Income (loss) from operations	635	(17,924)
Other income:
Interest income	361	116
Realized gain (loss) on foreign currency translation	(9)	45
Total other income	352	161
Income (loss) before income taxes	987	(17,763)
Income tax expense	(24)	(88)
Net income (loss)	$ 963	$ (17,851)
Net income (loss) per common share
Basic	$ 0.35	$ (6.6)
Diluted	$ 0.35	$ (6.6)
Weighted average common shares outstanding used in computing net income (loss) per common share
Basic	2,729,548	2,702,926
Diluted	2,734,721	2,702,926