Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Total revenues, net	$ 26,726	$ 26,235
Cost of revenues:
Impairment of Consumer Night Vision Business inventory		2,690
Total cost of revenues	19,998	22,241
Gross profit	6,728	3,994
Operating expenses:
Research and development	5,048	6,694
Selling, general and administrative	7,251	8,967
Total operating expenses	12,299	15,661
Loss from operations	(5,571)	(11,667)
Other income (expense):
Change in fair value of common stock warrant liability	1,474	2,194
Interest expense, net	(201)	(69)
Total other income	1,273	2,125
Loss before provision for income taxes	(4,298)	(9,542)
Income taxes
Net loss	$ (4,298)	$ (9,542)
Loss per share, basic	$ (0.09)	$ (0.21)
Loss per share, diluted	$ (0.09)	$ (0.21)
Weighted average number of shares outstanding:
Basic	48,132,714	44,429,114
Diluted	48,132,714	44,429,114
Product [Member]
Revenues:
Total revenues, net	$ 24,589	$ 23,322
Cost of revenues:
Cost of goods and services sold	18,775	17,797
Contract [Member]
Revenues:
Total revenues, net	2,137	2,913
Cost of revenues:
Cost of goods and services sold	$ 1,223	$ 1,754