Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Condensed Consolidated Statements of Operations and Comprehensive Loss [Abstract]
Net sales	$ 1,918	$ 1,630
Cost of goods sold	952	796
Gross margin	966	834
Operating expenses:
Selling, general and administrative	5,237	4,537
Research and development	947	864
Total operating expenses	6,184	5,401
Loss from operations	(5,218)	(4,567)
Other income (expense), net	(1)	1
Loss before income taxes	(5,219)	(4,566)
Income tax expense	(2)	(2)
Net loss	$ (5,221)	$ (4,568)
Basic loss per share (in dollars per share)	$ (1.25)	$ (11.54)
Diluted loss per share (in dollars per share)	$ (1.25)	$ (11.54)
Weighted average shares outstanding - basic (in shares)	4,212	548
Weighted average shares outstanding - diluted (in shares)	4,212	548
Other comprehensive loss:
Foreign currency translation adjustments	$ (3)	$ (3)
Total comprehensive loss	$ (5,224)	$ (4,571)