Nature of Business and Basis of Presentation, Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Loss per share [Abstract]
Net deemed dividends resulting from subsequent reduction in exercise price of warrants						$ 33
Potential shares of common stock that are not included in the calculation of diluted net loss per share [Abstract]
Potential shares of common stock that are not included in the calculation of diluted net loss per share (in shares)					2,879,319	2,467,481
Reported net loss with reported net loss per share [Abstract]
Net loss	$ (4,286)	$ (4,473)	$ (4,731)	$ (5,221)	$ (8,759)	$ (9,952)
Deemed dividend to preferred shareholders (see note 3)	0		0		0	(33)
Net loss after deemed dividend	$ (4,286)		$ (4,731)		$ (8,759)	$ (9,985)
Weighted average shares outstanding - basic (in shares)	10,538,000		6,532,000		10,538,000	4,887,000
Weighted average shares outstanding - diluted (in shares)	10,538,000		6,532,000		10,538,000	4,887,000
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)
Stock Options [Member]
Potential shares of common stock that are not included in the calculation of diluted net loss per share [Abstract]
Potential shares of common stock that are not included in the calculation of diluted net loss per share (in shares)					1,197,892	812,561
Warrants to Purchase Common Stock [Member]
Potential shares of common stock that are not included in the calculation of diluted net loss per share [Abstract]
Potential shares of common stock that are not included in the calculation of diluted net loss per share (in shares)					1,630,627	1,631,806
Series F Convertible Preferred Stock [Member]
Potential shares of common stock that are not included in the calculation of diluted net loss per share [Abstract]
Potential shares of common stock that are not included in the calculation of diluted net loss per share (in shares)					50,800	23,114