Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 10,131,000	$ 19,439,000
Short-term investments	8,837,000	0
Prepaid expenses and other current assets	474,000	389,000
Total current assets	19,442,000	19,828,000
Other assets	6,000	8,000
Total assets	19,448,000	19,836,000
Current liabilities:
Accounts payable, accrued expenses and other	411,000	589,000
Total current liabilities	411,000	589,000
Total liabilities	411,000	589,000
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at June 30, 2023 and December 31, 2022; no shares issued or outstanding at June 30, 2023 or December 31, 2022
Common stock, $0.01 par value: 30,000 shares authorized at June 30, 2023 and December 31, 2022; 14,321 and 14,215 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	1,343,000	1,342,000
Additional paid-in capital	565,992,000	565,541,000
Accumulated deficit	(548,298,000)	(547,636,000)
Total stockholders’ equity	19,037,000	19,247,000
Total liabilities and stockholders’ equity	$ 19,448,000	$ 19,836,000