Condensed Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Total revenue	$ 14,846	$ 14,347
Total cost of sales	6,416	6,024
Gross profit	8,430	8,323
Operating expenses:
Research and development	3,199	2,436
General and administrative	3,220	2,729
Sales and marketing	1,315	1,134
Total operating expenses	7,734	6,299
Income from operations	696	2,024
Interest expense	(63)	(75)
Other income (expense), net	128	(14)
Net income and comprehensive income	$ 761	$ 1,935
Net income per common share, Basic	$ 0.04	$ 0.10
Net income per common share, Diluted	$ 0.04	$ 0.09
Weighted average shares of common stock outstanding, basic	20,450,994	19,896,654
Weighted average shares of common stock outstanding, diluted	20,832,074	20,726,193
Product sales
Total revenue	$ 13,777	$ 12,671
Total cost of sales	6,123	5,752
Licensing, royalty, patent and other revenue
Total revenue	1,069	1,676
Total cost of sales	$ 293	$ 272