Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 44,049	$ 36,640
Marketable securities, available-for-sale	687	7,762
Prepaid expenses and other current assets	1,549	851
Total current assets	46,285	45,253
Total assets	46,285	45,253
Current liabilities:
Accounts payable	1,029	3,435
Accrued liabilities	1,986	2,687
Total current liabilities	3,015	6,122
Total liabilities	3,015	6,122
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.01 par value; 10,000,000 shares authorized, no shares issued and outstanding as of June 30, 2023 and December 31, 2022	0	0
Common stock, $0.01 par value; 20,000,000 shares authorized, 3,116,845 and 4,025,489 shares issued and outstanding as of June 30, 2023 and December 31, 2022, respectively	31	40
Additional paid-in capital	186,629	172,575
Accumulated other comprehensive loss	(7)	(57)
Accumulated deficit	(143,383)	(133,427)
Total stockholders' equity	43,270	39,131
Total liabilities and stockholders' equity	$ 46,285	$ 45,253