UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenue	$ 5,483	$ 7,375	$ 9,661	$ 14,920
Cost of goods sold	3,635	4,568	6,498	9,297
Gross profit	1,848	2,807	3,163	5,623
Operating expenses:
Sales and marketing	1,323	1,562	2,515	3,122
Research and product development	873	1,177	1,916	2,530
General and administrative	1,007	1,717	2,276	3,473
Total operating expenses	3,203	4,456	6,707	9,125
Operating loss	(1,355)	(1,649)	(3,544)	(3,502)
Interest expense	(91)	(94)	(383)	(195)
Other income, net	437	1,505	2,103	1,508
Loss before income taxes	(1,009)	(238)	(1,824)	(2,189)
Provision for income taxes	10	19	27	35
Net loss	$ (1,019)	$ (257)	$ (1,851)	$ (2,224)
Basic weighted average shares outstanding (in shares)	23,955,802	23,948,631	23,955,785	23,923,110
Diluted weighted average shares outstanding (in shares)	23,955,802	23,948,631	23,955,785	23,923,110
Basic loss per share (in dollars per share)	$ (0.04)	$ (0.01)	$ (0.08)	$ (0.09)
Diluted loss per share (in dollars per share)	$ (0.04)	$ (0.01)	$ (0.08)	$ (0.09)
Comprehensive loss:
Net loss	$ (1,019)	$ (257)	$ (1,851)	$ (2,224)
Unrealized loss on available-for-sale securities, net of tax	14	26	14	(2)
Change in foreign currency translation adjustment	(1)	(12)	4	(23)
Comprehensive loss	$ (1,006)	$ (243)	$ (1,833)	$ (2,249)