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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Current assets:    
Cash and cash equivalents $ 5,858,000 $ 5,990,000
Accounts receivable, net 31,000 424,000
Inventory, net 88,000 239,000
Prepaid expenses and other current assets 317,000 243,000
Total current assets 6,294,000 6,896,000
Operating lease - right of use asset, net 0 17,000
Other assets 11,000 12,000
Total assets 6,305,000 6,925,000
Current liabilities:    
Accounts payable 111,000 211,000
Accrued expenses and other current liabilities 1,059,000 1,038,000
Current portion of deferred revenue 77,000 132,000
Operating lease liabilities 0 17,000
Total current liabilities 1,247,000 1,398,000
Long-term liabilities:    
Deferred revenue, net of current portion 6,000 26,000
Total liabilities 1,253,000 1,424,000
Commitments and contingencies (see Note 9)
Stockholders’ equity:    
Preferred stock Series F, convertible; $0.0001 par value; $545,000 stated value; 42,000 shares authorized, 545 and 1,930 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively 0 0
Common stock, $0.0001 par value; 150,000,000 shares authorized; 28,249,971 shares issued and 28,242,418 shares outstanding at June 30, 2024 and 16,692,124 shares issued and 16,684,571 outstanding at December 31, 2023 3,000 2,000
Treasury Stock, 7,553 common shares (181,000) (181,000)
Additional paid-in capital 235,580,000 233,911,000
Accumulated deficit (230,350,000) (228,231,000)
Total stockholders' equity 5,052,000 5,501,000
Total liabilities and stockholders’ equity $ 6,305,000 $ 6,925,000