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, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
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)					562,513	40,819
Reported net loss with reported net loss per share [Abstract]
Net loss	$ (7,725)	$ (4,330)	$ (4,845)	$ (6,485)	$ (12,055)	$ (11,330)
Deemed dividend attributable to Series J Convertible Preferred Stock	0		0		541	0
Net loss attributable to common shareholders	$ (7,725)		$ (4,845)		$ (11,514)	$ (11,330)
Weighted average shares outstanding - basic (in shares)	409,690		37,949		294,649	35,060
Weighted average shares outstanding - diluted (in shares)	409,690		37,949		294,649	35,060
Basic loss per share (in dollars per share)	$ (18.85)		$ (127.65)		$ (40.91)	$ (323.15)
Diluted loss per share (in dollars per share)	$ (18.85)		$ (127.65)		$ (40.91)	$ (323.15)
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)					3,979	3,164
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)					543,232	37,401
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)					15,240	254
Series J 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)					62	0