Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Condensed Consolidated Statements of Operations and Comprehensive Loss [Abstract]
Net sales	$ 2,065	$ 1,853	$ 6,204	$ 6,279
Cost of goods sold	806	733	2,780	2,682
Gross profit	1,259	1,120	3,424	3,597
Operating expenses:
Selling, general and administrative	4,251	4,645	12,920	14,945
Research and development	928	1,726	3,141	3,847
Total operating expenses	5,179	6,371	16,061	18,792
Loss from operations	(3,920)	(5,251)	(12,637)	(15,195)
Other income (expense), net	52	(19)	14	(22)
Loss before income taxes	(3,868)	(5,270)	(12,623)	(15,217)
Income tax expense	(2)	(2)	(6)	(7)
Net loss	$ (3,870)	$ (5,272)	$ (12,629)	$ (15,224)
Basic loss per share (in dollars per share)	$ (0.37)	$ (0.75)	$ (1.2)	$ (2.72)
Diluted loss per share (in dollars per share)	$ (0.37)	$ (0.75)	$ (1.2)	$ (2.72)
Weighted average shares outstanding - basic (in shares)	10,538	7,098	10,538	5,624
Weighted average shares outstanding - diluted (in shares)	10,538	7,098	10,538	5,624
Other comprehensive loss:
Foreign currency translation adjustments	$ 2	$ 0	$ 1	$ (3)
Total comprehensive loss	$ (3,868)	$ (5,272)	$ (12,628)	$ (15,227)