Condensed Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total revenue	$ 14,707	$ 11,848	$ 29,054	$ 22,128
Total cost of sales	6,116	4,652	12,140	8,947
Gross profit	8,591	7,196	16,914	13,181
Operating expenses:
Research and development	2,699	3,357	5,135	5,796
General and administrative	2,860	2,338	5,589	5,181
Sales and marketing	1,292	1,045	2,426	2,032
Total operating expenses	6,851	6,740	13,150	13,009
Income (loss) from operations	1,740	456	3,764	172
Interest expense	(70)	(144)	(145)	(296)
Other expense, net	1	(12)	(13)	(27)
Net income (loss) before income taxes	1,671	300	3,606	(151)
Income tax expense		(44)		(53)
Net income (loss) and comprehensive income (loss)	$ 1,671	$ 256	$ 3,606	$ (204)
Net income (loss) per share attributable to common share, basic	$ 0.08	$ 0.01	$ 0.18	$ (0.01)
Net income (loss) per common share, diluted	$ 0.08	$ 0.01	$ 0.17	$ (0.01)
Weighted average shares of common stock outstanding, basic	20,069,444	19,313,162	19,983,526	19,203,374
Weighted average shares of common stock outstanding, diluted	20,424,283	19,726,064	20,626,547	19,203,374
Product sales
Total revenue	$ 13,223	$ 10,187	$ 25,894	$ 19,255
Total cost of sales	5,793	4,329	11,545	8,586
Licensing, royalty, patent and other revenue
Total revenue	1,484	1,661	3,160	2,873
Total cost of sales	$ 323	$ 323	$ 595	$ 361