CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash	$ 5,397	$ 11,446
Other receivables	647	951
Prepaid expenses and other current assets	471	1,284
Total current assets	6,515	13,681
Restricted cash	4,095	4,095
Property and equipment, net	215	236
Right-of-use assets - operating leases	989	1,030
Goodwill	2,044	2,044
Investment in non-controlling interest	8	59
Other assets	1,242	1,134
Total assets	15,108	22,279
Current liabilities:
Accounts payable	1,461	1,620
Accrued expenses	2,012	3,626
Income taxes payable	7	0
Operating lease liabilities, current	168	295
Due to related party, current	1,750	1,750
Other current liabilities	8	363
Total current liabilities	5,406	7,654
Warrant liabilities	376	331
Operating lease liabilities, non-current	841	887
Due to related party, non-current	768	1,206
Deferred revenue	250	0
Other liabilities	87	94
Total liabilities	7,728	10,172
Stockholders' equity:
Common stock, $0.005 par value, 100,000 shares authorized at March 31, 2023 and December 31, 2022; 5,127 issued and outstanding at both March 31, 2023 and December 31, 2022	26	26
Additional paid-in capital	178,066	177,377
Accumulated deficit	(170,713)	(165,297)
Total stockholders' equity	7,380	12,107
Total liabilities and stockholders' equity	15,108	22,279
Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, $0.005 par value, 1,000 shares authorized, 156 designated and outstanding of Series A convertible preferred stock at March 31, 2023 and December 31, 2022, $156 liquidation preference	$ 1	$ 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).

Name:	us-gaap_AccountsPayableCurrent
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).