Condensed Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total revenue	$ 15,241	$ 14,795	$ 44,295	$ 36,923
Total cost of sales	6,277	6,347	18,417	15,294
Gross profit	8,964	8,448	25,878	21,629
Operating expenses:
Research and development	2,879	3,105	8,014	8,901
General and administrative	2,971	2,996	8,560	8,177
Sales and marketing	1,203	1,272	3,629	3,304
Total operating expenses	7,053	7,373	20,203	20,382
Income (loss) from operations	1,911	1,075	5,675	1,247
Interest expense	(73)	(165)	(218)	(461)
Other expense, net	69	(8)	56	(35)
Net income before income taxes	1,907	902	5,513	751
Income tax expense		(22)		(75)
Net income and comprehensive income	$ 1,907	$ 880	$ 5,513	$ 676
Net income per share attributable to common share, basic	$ 0.09	$ 0.05	$ 0.27	$ 0.03
Net income per common share, diluted	$ 0.09	$ 0.04	$ 0.27	$ 0.03
Weighted average shares of common stock outstanding, basic	20,206,728	19,511,132	20,058,744	19,296,241
Weighted average shares of common stock outstanding, diluted	20,539,064	19,912,918	20,698,814	19,787,889
Product sales
Total revenue	$ 14,571	$ 12,037	$ 40,465	$ 31,292
Total cost of sales	6,122	6,043	17,667	14,629
Licensing, royalty, patent and other revenue
Total revenue	670	2,758	3,830	5,631
Total cost of sales	$ 155	$ 304	$ 750	$ 665