Consolidated Balance Sheets - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 4,965,000	$ 5,990,000
Accounts receivable, net	186,000	424,000
Inventory, net	0	239,000
Prepaid expenses and other current assets	118,000	243,000
Total current assets	5,269,000	6,896,000
Operating lease, right-of-use assets, net	0	17,000
Other assets	6,000	12,000
Total assets	5,275,000	6,925,000
Current liabilities:
Accounts payable	105,000	211,000
Accrued expenses and other current liabilities	1,131,000	1,038,000
Current portion deferred revenue	36,000	132,000
Operating lease liabilities, current	0	17,000
Total current liabilities	1,272,000	1,398,000
Long-term liabilities:
Deferred revenue, net of current portion	0	26,000
Total long-term liabilities	0	26,000
Total liabilities	1,272,000	1,424,000
Commitments and contingencies (see Note 14)
Stockholders’ equity:
Preferred stock Series F, convertible; $.0001 par value; $573,555 stated value; 42,000 shares authorized, 545 and 1,930 shares issued and outstanding on December 31, 2024 and December 31, 2023, respectively	0	0
Common stock, $.0001 par value; 150,000,000 shares authorized; 1,144,926 shares issued and 1,144,737 shares outstanding on December 31, 2024, respectively, and 573,644 shares issued and 573,455 outstanding on December 31, 2023, respectively	0	0
Treasury stock, 189 common shares on December 31, 2024 and 2023	(181,000)	(181,000)
Additional paid-in capital	236,458,000	233,913,000
Accumulated deficit	(232,274,000)	(228,231,000)
Total stockholders’ equity	4,003,000	5,501,000
Total liabilities and stockholders’ equity	$ 5,275,000	$ 6,925,000