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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net loss $ (6,499,000) $ (7,653,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 19,000 18,000
Abandonment and expiration of patents and trademark rights 615,000
Amortization of patent, trademark rights 94,000 101,000
Non-cash lease expense 81,000 150,000
Equity-based compensation 60,000 160,000
Loss (gain) on sale of marketable investments (18,000) 177,000
Loss on issuance of warrants 458,000
Amortization of financial obligation 183,000 270,000
Change in assets and liabilities:    
Funds receivable from New Jersey net operating loss 1,181,000
Other assets 761,000 (366,000)
Prepaid expenses and other current assets and other non-current assets 9,000 5,000
Lease liability (78,000) (149,000)
Accounts payable 914,000 (988,000)
Accrued expenses (33,000) (1,187,000)
Net cash used in operating activities (3,892,000) (7,823,000)
Cash flows from investing activities:    
Proceeds from sale of marketable investments 2,026,000 1,105,000
Purchase of marketable investments (91,000) (158,000)
(Purchase) abandonment of patent and trademark rights (283,000) (279,000)
Net cash provided by investing activities 1,652,000 668,000
Cash flows from financing activities:    
Proceeds from sale of stock, net of issuance costs 765,000 856,000
Proceeds from note payable, net of issuance costs 250,000 2,367,000
Proceeds from issuance of equity warrants 2,047,000
Net cash provided by financing activities 1,015,000 5,270,000
Net decrease in cash and cash equivalents (1,225,000) (1,885,000)
Cash and cash equivalents at beginning of period 1,701,000 5,439,000
Cash and cash equivalents at end of period 476,000 3,554,000
Supplemental disclosures of non-cash investing and financing cash flow information:    
Unrealized gain on marketable investments 85,000 42,000
Repayment of debt obligation with shares $ 421,000