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Condensed Consolidated Balance Sheets - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 3,554,000 $ 5,439,000
Marketable securities 6,507,000 7,631,000
Funds receivable from New Jersey net operating loss 1,184,000
Prepaid expenses and other current assets 300,000 302,000
Total current assets 10,361,000 14,556,000
Property and equipment, net 109,000 127,000
Right of use asset, net 700,000 697,000
Patent and trademark rights, net 2,491,000 2,313,000
Other assets 2,054,000 1,688,000
Total assets 15,715,000 19,381,000
Current liabilities:    
Accounts payable 5,455,000 6,443,000
Accrued expenses 799,000 1,986,000
Current portion of operating lease liability 234,000 223,000
Current portion of note payable, net 2,354,000
Total current liabilities 8,842,000 8,652,000
Long-term liabilities:    
Operating lease liability 488,000 495,000
Note payable, net 283,000
Total liabilities 9,613,000 9,147,000
Commitments and contingencies (Notes 12 and 13)
Stockholders’ equity:    
Common Stock, $0.001 par value, authorized shares - 350,000,000; issued and outstanding shares 57,136,680 and 49,102,484 as of June 30, 2024 and December 31, 2023, respectively 57,000 49,000
Additional paid-in capital 423,206,000 419,004,000
Accumulated deficit (417,161,000) (409,508,000)
Total stockholders’ equity 6,102,000 10,234,000
Total liabilities and stockholders’ equity 15,715,000 19,381,000
Series A Junior Participating Preferred Stock [Member]    
Stockholders’ equity:    
Series B Convertible Preferred Stock, stated value $1,000 per share, 10,000 shares authorized; no issued and outstanding as of June 30, 2024 and 689 issued and outstanding as December 31, 2023
Series B Convertible Preferred Stock [Member]    
Stockholders’ equity:    
Series B Convertible Preferred Stock, stated value $1,000 per share, 10,000 shares authorized; no issued and outstanding as of June 30, 2024 and 689 issued and outstanding as December 31, 2023 $ 689,000