Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 4,275	$ 3,137
Prepaid expenses and other current assets	108	537
Total current assets	4,383	3,674
Property and equipment, net	1	3
Right-of-use lease asset	17	5
Non-current deposits		412
Total assets	4,401	4,094
Current liabilities:
Accounts payable	221	4,599
Accrued and other current liabilities	539	1,669
Total current liabilities	760	6,268
Lease liability	10
Total liabilities	770	6,268
Stockholders’ equity (deficit):
Common stock, $0.001 par value; 600,000,000 shares authorized at June 30, 2025 and December 31, 2024; 1,583,965 shares issued and outstanding at June 30, 2025 and 36,913 shares issued and outstanding at December 31, 2024	2
Additional paid-in capital	445,405	438,211
Accumulated other comprehensive loss		(891)
Accumulated deficit	(441,779)	(439,494)
Total stockholders’ equity (deficit)	3,631	(2,174)
Total liabilities and stockholders’ equity (deficit)	4,401	4,094
6% Convertible Exchangeable Preferred Stock [Member]
Stockholders’ equity (deficit):
Preferred stock, value
Series A Preferred Stock [Member]
Stockholders’ equity (deficit):
Preferred stock, value
Series B Preferred Stock [Member]
Stockholders’ equity (deficit):
Preferred stock, value
Series C Preferred Stock [Member]
Stockholders’ equity (deficit):
Preferred stock, value
Series D Preferred Stock [Member]
Stockholders’ equity (deficit):
Preferred stock, value
Series E Preferred Stock [Member]
Stockholders’ equity (deficit):
Preferred stock, value
Series F Preferred Stock [Member]
Stockholders’ equity (deficit):
Preferred stock, value	$ 3

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).