Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 13,167	$ 5,194
Investments	499	16,048
Prepaid expenses and other current assets	261	606
Restricted cash	25	25
Total current assets	13,952	21,873
Operating lease, right-of-use asset		40
Other non-current assets		24
Property and equipment, net	39	70
Total assets	13,991	22,007
Current liabilities:
Accounts payable	136	1,720
Accrued expenses and other current liabilities	1,061	1,631
Operating lease liability, current portion		33
Total current liabilities	1,197	3,384
Total liabilities	1,197	3,384
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized and no shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively
Common stock, $0.001 par value; 45,000,000 shares authorized at June 30, 2023 and December 31, 2022, respectively; 4,541,167 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	91	91
Additional paid-in capital	292,056	291,365
Accumulated other comprehensive loss	(2)	(48)
Accumulated deficit	(279,351)	(272,785)
Total stockholders’ equity	12,794	18,623
Total liabilities and stockholders’ equity	$ 13,991	$ 22,007