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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net loss $ (12,582) $ (38,780)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 52 120
Stock-based compensation 1,163 1,110
Amortization of right-of-use asset 142 1,450
Gain on lease termination (1,576)
Loss on disposal of fixed assets 13
Accrued interest expense 22 441
Paid-in-kind interest expense 829
Amortization of debt discount and debt issuance costs 2,148
Forward sales contract expense 5,847
(Gain) loss on extinguishment of debt (734) 22,440
Fair value adjustments to bridge notes derivative liability 1,038
Issuance of common stock in connection with settlement 69
Issuance of common stock to consultant for services 141
Change in fair value of warrant liabilities (1) (897)
Change in fair value of contingent consideration liability (66)
Changes in operating assets and liabilities:    
Other receivables 284 238
Prepaid expenses and other current assets (43) 1,226
Other non-current assets 2 1
Accounts payable and accrued expenses (163) 758
Operating lease liability (145) (1,656)
Due to related party (646)
Deferred revenue (582)
Other liabilities 64 113
Net cash used in operating activities (5,869) (12,291)
Cash flows from investing activities:    
Purchase of property and equipment (22) (369)
Proceeds received from the sale of fixed assets 4
Net cash used in investing activities (22) (365)
Cash flows from financing activities:    
Proceeds received from notes payable 2,250
Proceeds received from issuance of common stock and prefunded warrants 4,929
Proceeds received from exercise of prefunded warrants 30
Proceeds received from the convertible notes financing 1,405
Fees paid related to the convertible notes financing (34)
Proceeds received from bridge notes financing 3,887
Dividends paid to Series A preferred stockholders (8)
Net cash provided by financing activities 7,209 5,250
Net increase (decrease) in cash and cash equivalents 1,318 (7,406)
Cash at beginning of period 1,729 11,670
Cash at end of period 3,047 4,264
Cash paid during the period for:    
Interest 5 46
Income taxes 3 2
Supplemental disclosure of non-cash investing and financing activities:    
Offset of related party notes payable principal with related party receivable related to issuance of common stock and prefunded warrants 2,250
Reclassification of forward sales contract to equity upon issuance of common stock 5,847
Issuance of common stock to Series A preferred stockholders in lieu of cash dividends 8
Adjustment to lease liability and ROU asset due to remeasurement (13) 4,245
Leasehold improvements funded by tenant improvement allowance 50
Note warrants issued 755
Unpaid fees incurred in connection with the convertible note financing 32
Paid in-kind interest added to convertible notes principal 1,006
Reclassification of warrants to liability $ 11,244