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
Income Statement [Abstract]
Sales	$ 4,296	$ 6,649	$ 9,293	$ 12,278
Cost of sales	2,202	1,975	4,215	4,041
Gross profit	2,094	4,674	5,078	8,237
Other costs and expenses:
Research and development	975	888	1,955	1,618
Professional services	1,658	1,661	4,047	3,779
Salaries and related costs	3,439	3,510	6,750	6,998
Selling, general and administrative	2,189	3,037	5,985	5,994
Total other costs and expenses	8,261	9,096	18,737	18,389
Loss from operations	(6,167)	(4,422)	(13,659)	(10,152)
Interest income	7	403	223	826
Interest expense	(8)	0	(14)	0
Other (loss) income, net	(14)	(200)	412	(495)
Total other (loss) income, net	(15)	203	621	331
Loss before income taxes	(6,182)	(4,219)	(13,038)	(9,821)
Income tax (benefit) expense	(1,492)	76	(6,397)	82
Net loss	$ (4,690)	$ (4,295)	$ (6,641)	$ (9,903)
Earnings (loss) per Share:
Basic and diluted (in dollars per share)	$ (0.14)	$ (0.13)	$ (0.19)	$ (0.30)