Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 28,040	$ 23,095
Restricted cash	3,215
Short-term investments		6,371
Short-term investments, restricted	19,896	23,370
Prepaid insurance	116	208
Other current assets	229	139
Total current assets	51,496	53,183
Total assets	51,496	53,183
Current liabilities:
Accounts payable	153	136
Accrued legal and professional	512	721
Accrued expenses and other current liabilities	195	207
Total current liabilities	860	1,064
Liabilities subject to compromise	9,578	9,884
Total liabilities	10,438	10,948
Commitments and contingencies (Note 7)
Stockholders’ equity
Additional paid in capital	1,183,904	1,184,505
Accumulated other comprehensive income	592	666
Accumulated deficit	(1,179,626)	(1,178,415)
Total stockholders’ equity	4,894	6,780
Total liabilities, mezzanine equity and stockholders’ equity	51,496	53,183
Series A Convertible Preferred Stock [Member]
Mezzanine equity
Series A Convertible Preferred stock, $0.0001 par value, 12,000,000 shares authorized; 300,000 shares issued and outstanding as of March 31, 2025 and December 31, 2024	36,164	35,455
Common Class A [Member]
Stockholders’ equity
Class A common stock, $0.0001 par value, 450,000,000 shares authorized; 16,096,296 shares issued and outstanding as of March 31, 2025 and December 31, 2024	$ 24	$ 24