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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities    
Net loss $ (15,973,000) $ (21,413,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 958,000 946,000
Interest earned on marketable securities 0 0
Interest earned on marketable securities 60,000 220,000
Equity-based compensation 2,328,000 2,032,000
Non-cash write-off of intangible assets   290,000
Changes in operating assets and liabilities:    
Accounts and grants receivable 27,000 107,000
Prepaid expenses and other current assets 68,000 28,000
Other assets (9,000) 51,000
Accounts payable (540,000) (1,113,000)
Deferred revenue (466,000)  
Nonoperating lawsuit expense   (1,398,000)
Accrued expenses (332,000) 1,502,000
Operating lease asset and liability (254,000) (254,000)
Other liabilities 265,000  
Net cash used in operating activities (13,868,000) (19,002,000)
Cash flows from investing activities    
Proceeds from the sale of marketable securities 352,000 8,880,000
Acquisition of property and equipment (655,000) (301,000)
Acquisition of intangible assets (337,000) (393,000)
Net cash (used in) provided by investing activities (640,000) 8,186,000
Cash flows from financing activities    
Proceeds from the issuance of common stock, net of issuance cost 12,866,000 5,338,000
Proceeds from warrants exercised, net of issuance cost 16,191,000 98,000
Proceeds from stock subscription receivable 100,000  
Payments for taxes on RSUs vested and PSUs vested (366,000) (174,000)
Net cash provided by financing activities 28,791,000 5,262,000
Change in cash and cash equivalents 14,283,000 (5,554,000)
Cash and cash equivalents at beginning of period 4,949,000 10,503,000
Cash and cash equivalents at end of period 19,232,000 4,949,000
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Vesting of RSUs and PSUs into Class A common stock (1,109,000) (777,000)
Deemed dividend – warrant inducement offers $ 8,650,000 $ 798,000