Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Total revenues, net	$ 7,700	$ 5,361	$ 14,431	$ 11,473
Cost of revenues:
Total cost of revenues	5,724	5,136	11,021	9,912
Gross profit	1,976	225	3,410	1,561
Operating expenses:
Research and development	1,599	1,300	2,579	2,897
Selling, general and administrative	1,712	1,777	3,510	3,716
Total operating expenses	3,311	3,077	6,089	6,613
Loss from operations	(1,335)	(2,852)	(2,679)	(5,052)
Other income (expense):
Change in fair value of common stock warrant liability	(1,481)	536	(1,501)	1,330
Interest expense, net	(18)	(21)	(35)	(55)
Other income, net	3		15
Total other (expense) income	(1,496)	515	(1,521)	1,275
Loss before provision for income taxes	(2,831)	(2,337)	(4,200)	(3,777)
Income taxes
Net loss	$ (2,831)	$ (2,337)	$ (4,200)	$ (3,777)
Loss per share, basic and diluted	$ (0.05)	$ (0.05)	$ (0.08)	$ (0.08)
Weighted average number of shares outstanding:
Basic and Diluted	56,754,867	48,817,940	54,196,732	46,979,505
Product [Member]
Revenues:
Total revenues, net	$ 6,260	$ 4,958	$ 11,894	$ 10,465
Cost of revenues:
Cost of revenues	4,978	4,898	9,768	9,324
Contract [Member]
Revenues:
Total revenues, net	1,440	403	2,537	1,008
Cost of revenues:
Cost of revenues	$ 746	$ 238	$ 1,253	$ 588