CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash	$ 9,035	$ 11,781
Restricted cash	50	50
Prepaid expenses and other current assets	319	615
Total current assets	9,404	12,446
Right of use asset	130	161
Property and equipment, net	167	183
Other assets	6	24
Total assets	9,707	12,814
Current liabilities:
Accounts payable	902	779
Accrued expenses	1,356	1,025
Lease liability	138	135
Total current liabilities	2,396	1,939
Lease liability, net of current portion	0	35
Total liabilities	2,396	1,974
Commitments and contingencies (Note 2)
Series D Preferred Stock, $0.0001 par value; 0 and 1 shares authorized, issued and outstanding at March 31, 2023 and December 31, 2022, respectively	0	2
Stockholders’ equity:
Common stock, $0.0001 par value, 100,000,000 shares authorized; 1,150,582 and 1,139,024 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	0	0
Additional paid-in capital	139,293	139,218
Accumulated deficit	(131,982)	(128,380)
Total stockholders’ equity	7,311	10,838
Total liabilities, preferred stock and stockholders’ equity	$ 9,707	$ 12,814