Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from external customers	$ 8,155	$ 6,452	$ 16,334	$ 25,555
Costs and expenses:
Cost of sales	2,249	3,563	8,299	14,754
Selling, general and administrative	3,184	3,822	9,825	12,735
Restructuring charge	0	0	0	625
Research and development	285	352	880	823
Intangible assets abandonment		76		127
Costs and Expenses, Total	5,718	7,813	19,004	29,064
Operating income (loss) from continuing operations	2,437	(1,361)	(2,670)	(3,509)
Interest expense	(9)	(4)	(15)	(8)
Interest income	3	19	16	30
Other income (expense), net	(55)	71	83	(1)
Income (loss) from continuing operations before income taxes	2,376	(1,275)	(2,586)	(3,488)
Income tax expense		(21)	(149)	(23)
Net income (loss) from continuing operations	2,376	(1,296)	(2,735)	(3,511)
Income (Loss) from discontinued operations		18		(1)
Net loss	$ 2,376	$ (1,278)	$ (2,735)	$ (3,512)
Basic
Continuing operations (in dollars per share)	$ 0.10	$ (0.05)	$ (0.11)	$ (0.15)
Discontinued operations (in dollars per share)
Basic net income (loss) per common share (in dollars per share)	0.10	(0.05)	(0.11)	(0.15)
Diluted
Continuing operations (in dollars per share)	0.09	(0.05)	(0.11)	(0.15)
Discontinued operations (in dollars per share)
Diluted net income (loss) per common share (in dollars per share)	$ 0.09	$ (0.05)	$ (0.11)	$ (0.15)
Weighted-average number of common shares outstanding:
Basic (in shares)	24,701,000	24,187,000	24,656,000	24,183,000
Diluted (in shares)	25,120,000	24,187,000	24,656,000	24,183,000