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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net loss $ (11,341) $ (12,176)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 35 83
Stock-based compensation 870 705
Amortization of right-of-use asset 89 1,036
Gain on disposal of fixed assets (2)
Accrued interest expense 22 422
Paid-in-kind interest expense 407
Amortization of debt discount and debt issuance costs 919
Forward sales contract expense 5,847
Issuance of common stock in connection with settlement 69
Issuance of common stock to consultant for services 93
Change in fair value of warrant liabilities (1) (66)
Change in fair value of contingent consideration liability (66)
Changes in operating assets and liabilities:    
Other receivables 283 197
Prepaid expenses and other current assets (137) 734
Other non-current assets 1 1
Accounts payable and accrued expenses (463) 1,549
Operating lease liability (91) 995
Due to related party (874)
Deferred revenue (95)
Other liabilities 127 225
Net cash used in operating activities (4,597) (6,006)
Cash flows from investing activities:    
Purchase of property and equipment (350)
Proceeds received from the sale of fixed assets 4
Net cash used in investing activities (346)
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 4
Proceeds received from the convertible notes financing 1,405
Fees paid related to the convertible notes financing (34)
Dividends paid to Series A preferred stockholders (8)
Net cash provided by financing activities 7,183 1,363
Net increase (decrease) in cash and cash equivalents 2,586 (4,989)
Cash, cash equivalents and restricted cash at beginning of period 1,729 11,670
Total cash, cash equivalents and restricted cash at end of period 4,315 6,681
Cash paid during the period for:    
Interest 4 6
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
Note warrants issued 755
Unpaid fees incurred in connection with the convertible note financing 32
Paid in-kind interest added to convertible notes principal 584
Adjustment to lease liability and ROU asset due to remeasurement 4,245
Property and equipment purchased but not paid 18
Reconciliation of cash, cash equivalents and restricted cash at end of period:    
Cash and cash equivalents 4,315 2,586
Restricted cash $ 4,095