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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 5,619,000 $ 5,990,000
Accounts receivable, net 33,000 424,000
Inventory, net 50,000 239,000
Prepaid expenses and other current assets 283,000 243,000
Total current assets 5,985,000 6,896,000
Operating lease - right of use asset, net 0 17,000
Other assets 8,000 12,000
Total assets 5,993,000 6,925,000
Current liabilities:    
Accounts payable 93,000 211,000
Accrued expenses and other current liabilities 1,175,000 1,038,000
Current portion of deferred revenue 52,000 132,000
Operating lease liabilities 0 17,000
Total current liabilities 1,320,000 1,398,000
Long-term liabilities:    
Deferred revenue, net of current portion 2,000 26,000
Total liabilities 1,322,000 1,424,000
Commitments and contingencies (see Note 9)
Stockholders’ equity:    
Preferred stock Series F, convertible; $0.0001 par value; $560,884 stated value; 42,000 shares authorized, 545 and 1,930 shares issued and outstanding at September 30, 2024 and December 31, 2023, respectively 0 0
Common stock, $0.0001 par value; 150,000,000 shares authorized; 1,071,545 shares issued and 1,071,356 shares outstanding at September 30, 2024 and 573,644 shares issued and 573,455 outstanding at December 31, 2023 0 0
Treasury Stock, 189 common shares (181,000) (181,000)
Additional paid-in capital 236,242,000 233,913,000
Accumulated deficit (231,390,000) (228,231,000)
Total stockholders' equity 4,671,000 5,501,000
Total liabilities and stockholders’ equity $ 5,993,000 $ 6,925,000