Condensed Consolidated Statement of Changes in Convertible Preferred Stock and Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Series X Non-Voting Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] Series X Non-Voting Convertible Preferred Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Series X Non-Voting Convertible Preferred Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Beginning balance, shares at Dec. 31, 2022			4,541,167
Beginning balance at Dec. 31, 2022	$ 18,623		$ 91		$ 291,365		$ (48)	$ (272,785)
Stock-based compensation expense	391				391
Unrealized gain on investments	38						38
Net loss	(4,779)							(4,779)
Ending balance, shares at Mar. 31, 2023			4,541,167
Ending balance at Mar. 31, 2023	14,273		$ 91		291,756		(10)	(277,564)
Beginning balance, shares at Dec. 31, 2022			4,541,167
Beginning balance at Dec. 31, 2022	$ 18,623		$ 91		291,365		(48)	(272,785)
Exercises of stock options, shares	0
Unrealized gain on investments	$ 46
Net loss	(6,566)
Ending balance, shares at Jun. 30, 2023			4,541,167
Ending balance at Jun. 30, 2023	12,794		$ 91		292,056		(2)	(279,351)
Beginning balance, shares at Mar. 31, 2023			4,541,167
Beginning balance at Mar. 31, 2023	14,273		$ 91		291,756		(10)	(277,564)
Stock-based compensation expense	300				300
Unrealized gain on investments	8						8
Net loss	(1,787)							(1,787)
Ending balance, shares at Jun. 30, 2023			4,541,167
Ending balance at Jun. 30, 2023	$ 12,794		$ 91		292,056		(2)	(279,351)
Beginning balance, shares at Dec. 31, 2023	4,885,512		4,885,512
Beginning balance at Dec. 31, 2023	$ 98,297	$ 91,410	$ 91		295,376		(63)	(288,517)
Beginning balance, shares at Dec. 31, 2023		24,610
Issuance of common stock in connection with conversion of Series X non-voting convertible preferred stock, value		$ (44,826)
Issuance of common stock in connection with conversion of Series X non-voting convertible preferred stock, shares		(11,957)
Issuance of common stock				$ 12		$ 44,814
Issuance of common stock, shares				11,957,000
Stock-based compensation expense	150				150
Net loss	(7,113)							(7,113)
Ending balance, shares at Mar. 31, 2024			16,842,512
Ending balance at Mar. 31, 2024	$ 91,334	$ 46,584	$ 103		340,340		(63)	(295,630)
Ending balance, shares at Mar. 31, 2024		12,653
Beginning balance, shares at Dec. 31, 2023	4,885,512		4,885,512
Beginning balance at Dec. 31, 2023	$ 98,297	$ 91,410	$ 91		295,376		(63)	(288,517)
Beginning balance, shares at Dec. 31, 2023		24,610
Exercises of stock options, shares	88,068
Unrealized gain on investments	$ 41
Net loss	$ (16,055)
Ending balance, shares at Jun. 30, 2024	21,625,085		21,625,085
Ending balance at Jun. 30, 2024	$ 101,021	$ 45,005	$ 107		360,503		(22)	(304,572)
Ending balance, shares at Jun. 30, 2024		12,232
Beginning balance, shares at Mar. 31, 2024			16,842,512
Beginning balance at Mar. 31, 2024	91,334	$ 46,584	$ 103		340,340		(63)	(295,630)
Beginning balance, shares at Mar. 31, 2024		12,653
Issuance of common stock in connection with conversion of Series X non-voting convertible preferred stock, value		$ (1,579)
Issuance of common stock in connection with conversion of Series X non-voting convertible preferred stock, shares		(421)
Issuance of common stock	10,937	$ (1)	$ 4		10,933	$ 1,578
Issuance of common stock, shares			4,273,505	421,000
Issuance of warrants	7,225				7,225
Stock-based compensation expense	326				326
Exercises of stock options	101				101
Exercises of stock options, shares			88,068
Unrealized gain on investments	41						41
Net loss	$ (8,942)							(8,942)
Ending balance, shares at Jun. 30, 2024	21,625,085		21,625,085
Ending balance at Jun. 30, 2024	$ 101,021	$ 45,005	$ 107		$ 360,503		$ (22)	$ (304,572)
Ending balance, shares at Jun. 30, 2024		12,232