Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 3,450	$ 3,137
Prepaid expenses and other current assets	264	537
Total current assets	3,714	3,674
Property and equipment, net	1	3
Right-of-use lease asset	19	5
Non-current deposits		412
Total assets	3,734	4,094
Current liabilities:
Accounts payable	114	4,599
Accrued and other current liabilities	549	1,669
Total current liabilities	663	6,268
Lease liability	9
Total liabilities	672	6,268
Stockholders’ equity (deficit):
Common stock, $0.001 par value; 250,000,000 shares authorized at March 31, 2025 and 100,000,000 shares authorized at December 31, 2024; 207,336,389 shares issued and outstanding at March 31, 2025 and 8,859,133 shares issued and outstanding at December 31, 2024	204	9
Additional paid-in capital	443,318	438,202
Accumulated other comprehensive loss		(891)
Accumulated deficit	(440,461)	(439,494)
Total stockholders’ equity (deficit)	3,062	(2,174)
Total liabilities and stockholders’ equity (deficit)	3,734	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	$ 1

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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Namespace Prefix:	us-gaap_
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).