Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Common Stock [Member] Series I Convertible Preferred Stock [Member]	Common Stock [Member] Series J Convertible Preferred Stock [Member]	Additional Paid in Capital [Member]	Additional Paid in Capital [Member] Series I Convertible Preferred Stock [Member]	Additional Paid in Capital [Member] Series J Convertible Preferred Stock [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Other Comprehensive Income [Member] Series I Convertible Preferred Stock [Member]	Accumulated Other Comprehensive Income [Member] Series J Convertible Preferred Stock [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Series I Convertible Preferred Stock [Member]	Accumulated Deficit [Member] Series J Convertible Preferred Stock [Member]	Total	Series I Convertible Preferred Stock [Member]	Series J Convertible Preferred Stock [Member]
Balance at Dec. 31, 2021	$ 0			$ 278,874			$ (35)			$ (252,892)			$ 25,947
Balance (in shares) at Dec. 31, 2021	105,376
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0			0			0			(14,525)			(14,525)
Unrealized foreign currency translation adjustment	0			0			(7)			0			(7)
Unrealized gain on marketable securities	0			0			80			0			80
Stock-based compensation	$ 0			862			0			0			862
Stock-based compensation (in shares)	0
Issuance of common stock from ATM offering, net	$ 0			0			0			0			0
Issuance of common stock from ATM offering, net (in shares)	209,940
Issuance of common stock from conversion of convertible preferred stock	$ 0			0			0			0			0
Issuance of common stock from conversion of convertible preferred stock (in shares)	221,078
Balance at Dec. 31, 2022	$ 0			279,736			38			(267,417)			12,357
Balance (in shares) at Dec. 31, 2022	536,394
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0			0			0			(20,209)			(20,209)
Unrealized foreign currency translation adjustment	0			0			(13)			0			(13)
Unrealized gain on marketable securities	0			0			(56)			0			(56)
Stock-based compensation	$ 0			670			0			0			670
Stock-based compensation (in shares)	0
Issuance of common stock from ATM offering, net	$ 0			2,119			0			0			2,119
Issuance of common stock from ATM offering, net (in shares)	657,333
Issuance of common stock from conversion of convertible preferred stock		$ 0	$ 1		$ 0	$ 2,620		$ 0	$ 0		$ 0	$ 0		$ 0	$ 2,621
Issuance of common stock from conversion of convertible preferred stock (in shares)		10,493	3,417,079
Issuance costs related to 2022 common stock offering	$ 0			(11)			0			0			(11)
Issuance of common stock from exercise of warrants		$ 0			$ 307			$ 0			$ 0			$ 307
Issuance of common stock from warrant conversions (in shares)		1,061,162
Reclassification of warrants to equity	0			7,623			0			0			7,623
Series J Convertible Preferred Stock deemed dividend	0			(2,297)			0			0			(2,297)
Series J Convertible Preferred Stock PIK dividend	0			(121)			0			0			(121)
Balance at Dec. 31, 2023	$ 1			$ 290,646			$ (31)			$ (287,626)			$ 2,990
Balance (in shares) at Dec. 31, 2023	5,682,461