Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Total Revenue	$ 3,159	$ 3,372
Cost of revenue:
Total Cost of revenue	623	777
Gross profit	2,536	2,595
Operating expenses:
Selling, general and administrative	1,909	1,665
Research and development	902	620
Restructuring charges	0	2
Total Operating expenses	2,811	2,287
Income (loss) from operations before income taxes	(275)	308
Income tax benefit	(164)	0
Net income (loss)	$ (111)	$ 308
Net income (loss) per share:
Basic (in dollars per share)	$ (0.02)	$ 0.06
Diluted (in dollars per share)	$ (0.02)	$ 0.06
Weighted average number of common shares outstanding:
Basic (in shares)	5,267	5,224
Diluted (in shares)	5,267	5,243
Product sales [Member]
Revenue:
Total Revenue	$ 1,050	$ 1,621
Cost of revenue:
Total Cost of revenue	531	685
Royalties [Member]
Revenue:
Total Revenue	2,109	1,751
Cost of revenue:
Total Cost of revenue	$ 92	$ 92