Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Condensed Consolidated Statements of Operations and Comprehensive Loss [Abstract]
Net sales	$ 1,926	$ 1,918
Cost of goods sold	824	952
Gross profit	1,102	966
Operating expenses:
Selling, general and administrative	4,412	5,237
Research and development	1,106	947
Total operating expenses	5,518	6,184
Loss from operations	(4,416)	(5,218)
Other income (expense), net	(55)	(1)
Loss before income taxes	(4,471)	(5,219)
Income tax expense	(2)	(2)
Net loss	$ (4,473)	$ (5,221)
Basic loss per share (in dollars per share)	$ (0.42)	$ (1.62)
Diluted loss per share (in dollars per share)	$ (0.42)	$ (1.62)
Weighted average shares outstanding - basic (in shares)	10,538	3,242
Weighted average shares outstanding - diluted (in shares)	10,538	3,242
Other comprehensive loss:
Unrealized foreign currency translation adjustments	$ (2)	$ (3)
Total comprehensive loss	$ (4,475)	$ (5,224)