Nature of Business and Significant Accounting Policies, Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
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)	3,495,757	705,302
Reconciliation of reported net loss with reported net loss per share [Abstract]
Net loss to common stockholders	$ (20,209)	$ (14,525)
Deemed dividend attributable to Series J Convertible Preferred Stock	(2,297)	0
Dividend on Series J Convertible Preferred Stock	(121)	0
Net loss attributable to common stockholders	$ (22,627)	$ (14,525)
Weighted average shares outstanding - basic (in shares)	1,964,406	173,846
Weighted average shares outstanding - diluted (in shares)	1,964,406	173,846
Basic loss per share (in dollars per share)	$ (11.52)	$ (83.55)
Diluted loss per share (in dollars per share)	$ (11.52)	$ (83.55)
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)	110,916	10,485
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)	2,963,192	679,244
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)	125,857	5,080
Series I 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)	0	10,493
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)	295,792	0