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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net loss $ (4,333) $ (5,250)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation 8 8
Share-based compensation expense 1,083 912
Amortization of right-of-use assets 199 173
Other non-cash expense 1 0
Changes in operating assets and liabilities    
Accounts receivable - other 4 0
Prepaid expenses (324) (5)
Accounts payable (92) (440)
Accrued liabilities 245 (1,147)
Operating lease liabilities (192) (167)
Other changes in operating assets and liabilities (42) 33
Net cash used in operating activities (3,443) (5,883)
Cash flows from investing activities:    
Additions to property, plant and equipment (459) (2,020)
Reimbursements of development costs in accordance with the JDA 141 1,468
Net cash used in investing activities (318) (552)
Cash flows from financing activities:    
Issuance of Class A common stock to Cottonmouth 0 50,000
Payment of equity issuance costs 0 (554)
Net cash provided by financing activities 0 49,446
Net change in cash, cash equivalents and restricted cash (3,761) 43,011
Cash, cash equivalents and restricted cash, beginning of year 57,315 19,144
Cash, cash equivalents and restricted cash, end of period 53,554 62,155
Supplemental cash flows:    
Capital expenditures in accounts payable and accrued liabilities (at period end) 0 1,467
Accounts receivable for reimbursement of capital expenditures (at period end) $ 0 $ 1,006