CONDENSED 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]
Revenues, net	$ 305	$ 277	$ 538	$ 472
Cost of sales	163	141	304	246
Gross profit	142	136	234	226
Operating expenses:
Research and development	381	431	768	947
Selling, general and administrative	1,761	2,277	3,511	4,184
Total operating expenses	2,142	2,708	4,279	5,131
Loss from operations	(2,000)	(2,572)	(4,045)	(4,905)
Other income (expense):
Interest income	7	1	15	3
Interest expense	0	0	0	(1)
Miscellaneous income	0	2	0	2
Other income, net	7	3	15	4
Net loss	(1,993)	(2,569)	(4,030)	(4,901)
Comprehensive loss	$ (1,993)	$ (2,569)	$ (4,030)	$ (4,901)
Weighted average shares outstanding - basic (in shares)	2,860,874	610,635	2,208,162	610,543
Weighted average shares outstanding - diluted (in shares)	2,860,874	610,635	2,208,162	610,543
Net loss per share - basic (in dollars per share)	$ (0.70)	$ (4.21)	$ (1.83)	$ (8.03)
Net loss per share - diluted (in dollars per share)	$ (0.70)	$ (4.21)	$ (1.83)	$ (8.03)