UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 4,889	$ 6,264	$ 14,550	$ 21,184
Cost of goods sold	3,273	3,694	9,771	12,991
Gross profit	1,616	2,570	4,779	8,193
Operating expenses:
Sales and marketing	1,119	1,151	3,634	4,273
Research and product development	889	876	2,805	3,406
General and administrative	1,097	1,673	3,373	5,146
Total operating expenses	3,105	3,700	9,812	12,825
Operating loss	(1,489)	(1,130)	(5,033)	(4,632)
Interest expense	(86)	(90)	(469)	(285)
Other income, net	243	(3)	2,346	1,505
Loss before income taxes	(1,332)	(1,223)	(3,156)	(3,412)
Provision for income taxes	19	25	46	60
Net loss	$ (1,351)	$ (1,248)	$ (3,202)	$ (3,472)
Basic weighted average shares outstanding (in shares)	23,960,313	23,952,555	23,957,311	23,933,033
Diluted weighted average shares outstanding (in shares)	23,960,313	23,952,555	23,957,311	23,933,033
Basic loss per share (in dollars per share)	$ (0.06)	$ (0.05)	$ (0.13)	$ (0.15)
Diluted loss per share (in dollars per share)	$ (0.06)	$ (0.05)	$ (0.13)	$ (0.15)
Comprehensive loss:
Net loss	$ (1,351)	$ (1,248)	$ (3,202)	$ (3,472)
Unrealized loss on available-for-sale securities, net of tax	(31)	0	(17)	(2)
Change in foreign currency translation adjustment	(7)	(22)	(3)	(45)
Comprehensive loss	$ (1,389)	$ (1,270)	$ (3,222)	$ (3,519)