Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Consolidated Statements of Operations and Comprehensive Loss [Abstract]
Net sales	$ 7,921	$ 7,441
Cost of goods sold	3,430	3,384
Gross profit	4,491	4,057
Operating expenses:
Selling, general and administrative	19,039	17,417
Research and development	4,978	3,668
Total operating expenses	24,017	21,085
Loss from operations	(19,526)	(17,028)
Realized foreign currency translation gain from dissolution of subsidiary	0	1,202
Other income (expense), net	(43)	(1)
Loss before income taxes	(19,569)	(15,827)
Income tax expense	(9)	(9)
Net loss	$ (19,578)	$ (15,836)
Basic loss per share (in dollars per share)	$ (2.87)	$ (10.67)
Diluted loss per share (in dollars per share)	$ (2.87)	$ (10.67)
Weighted average shares outstanding - basic (in shares)	6,852	1,649
Weighted average shares outstanding - diluted (in shares)	6,852	1,649
Other comprehensive loss:
Realized foreign currency translation gain from dissolution of subsidiary	$ 0	$ (1,202)
Unrealized foreign currency translation adjustment	(4)	(19)
Total comprehensive loss	$ (19,582)	$ (17,057)