Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Condensed Consolidated Statements of Operations and Comprehensive Loss [Abstract]
Net sales	$ 2,213	$ 2,508	$ 4,139	$ 4,426
Cost of goods sold	1,150	997	1,974	1,949
Gross profit	1,063	1,511	2,165	2,477
Operating expenses:
Selling, general and administrative	4,257	5,063	8,669	10,300
Research and development	1,107	1,174	2,213	2,121
Total operating expenses	5,364	6,237	10,882	12,421
Loss from operations	(4,301)	(4,726)	(8,717)	(9,944)
Other income (expense), net	17	(2)	(38)	(3)
Loss before income taxes	(4,284)	(4,728)	(8,755)	(9,947)
Income tax expense	(2)	(3)	(4)	(5)
Net loss	$ (4,286)	$ (4,731)	$ (8,759)	$ (9,952)
Basic loss per share (in dollars per share)	$ (0.41)	$ (0.72)	$ (0.83)	$ (2.04)
Diluted loss per share (in dollars per share)	$ (0.41)	$ (0.72)	$ (0.83)	$ (2.04)
Weighted average shares outstanding - basic (in shares)	10,538	6,532	10,538	4,887
Weighted average shares outstanding - diluted (in shares)	10,538	6,532	10,538	4,887
Other comprehensive loss:
Foreign currency translation adjustments	$ 1	$ 0	$ (1)	$ (3)
Total comprehensive loss	$ (4,285)	$ (4,731)	$ (8,760)	$ (9,955)