CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash	$ 11,781	$ 24,057
Restricted cash	50	50
Prepaid expenses and other current assets	615	620
Total current assets	12,446	24,727
Right of use asset	161	283
Property and equipment, net	183	133
Other assets	24	27
Total assets	12,814	25,170
Current liabilities:
Accounts payable	779	283
Accrued expenses	1,025	2,660
Lease liability	135	125
Total current liabilities	1,939	3,068
Lease liability, net of current portion	35	170
Total liabilities	1,974	3,238
Commitments and contingencies (Footnote 8)
Stockholders’ equity:
Common stock, $0.0001 par value, 100,000,000 shares authorized; 1,139,024 and 1,127,917 shares issued and outstanding at December 31, 2022 and December 31, 2021, respectively	0	0
Additional paid-in capital	139,218	138,832
Accumulated deficit	(128,380)	(116,900)
Total stockholders’ equity	10,838	21,932
Total liabilities, preferred stock and stockholders’ equity	12,814	25,170
Series D Preferred Stock [Member]
Temporary Equity Abstract
Series D Preferred Stock, $0.0001 par value; 1 and 0 shares authorized, issued and outstanding at December 31, 2022 and December 31, 2021, respectively	$ 2	$ 0