Consolidated Balance Sheets - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 5,989,000	$ 19,439,000
Short-term investments	12,886,000	0
Prepaid expenses and other current assets	309,000	389,000
Total current assets	19,184,000	19,828,000
Other assets	4,000	8,000
Total assets	19,188,000	19,836,000
Current liabilities:
Accounts payable, accrued expenses and other	441,000	589,000
Total current liabilities	441,000	589,000
Total liabilities	441,000	589,000
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at December 31, 2023 and 2022 no shares issued or outstanding at December 31, 2023 or 2022
Common stock, $0.01 par value: 30,000 shares authorized at December 31, 2023 and 2022; 14,351 and 14,215 shares issued and outstanding at December 31,2023 and 2022	1,343,000	1,342,000
Additional paid-in capital	566,221,000	565,541,000
Accumulated deficit	(548,817,000)	(547,636,000)
Total stockholders’ equity	18,747,000	19,247,000
Total liabilities and stockholders’ equity	$ 19,188,000	$ 19,836,000