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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Operating activities:    
Net loss $ (87,537) $ (46,420)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Share-based compensation 8,314 7,660
Depreciation 8,341 6,933
Debt related fees and amortization expense 6,463 6,524
Intangibles and other amortization expense 46 72
Accretion and other expenses of Series A preferred units 12,698 25,313
Loss on asset disposals 3,702 0
Warrants issued for working capital agreement 0 409
Gain on debt extinguishment (162) 0
Deferred tax (benefit) expense 0 (750)
Changes in operating assets and liabilities:    
Accounts receivable 6,754 (7,422)
Inventories (7,766) (13,843)
Prepaid expenses 1,533 1,838
Tax credit sale receivable (12,300) 0
Other assets (2,839) (2,016)
Accounts payable (1,294) 13,726
Accrued interest expense and fees, net of interest paid 27,910 23,558
Other liabilities 3,208 (1,757)
Net cash provided by (used in) operating activities (32,929) 13,825
Investing activities:    
Capital expenditures (20,254) (33,119)
Grant proceeds received for capital expenditures 6,105 9,432
Net cash used in investing activities (14,149) (23,687)
Financing activities:    
Proceeds from borrowings 19,461 75,482
Repayments of borrowings (5,010) (56,130)
Lender debt renewal and waiver fee payments (1,441) (1,681)
Payments on Series A preferred financing 0 (30,000)
Payments on finance leases (179) (428)
Proceeds from sale of common stock 31,750 21,718
Proceeds from the exercise of stock options 36 133
Net cash provided by financing activities 44,617 9,094
Effect of exchange rate changes on cash and cash equivalents and restricted cash 12 49
Net change in cash and cash equivalents and restricted cash for period (2,449) (719)
Cash, cash equivalents, and restricted cash at beginning of period 6,280 6,999
Cash, cash equivalents, and restricted cash at end of period 3,831 6,280
Supplemental disclosures of cash flow information, cash paid:    
Cash paid for interest 9,223 9,813
Income taxes paid 1,814 20
Supplemental disclosures of cash flow information, non-cash transactions:    
Settlement of AP via issuance of RSAs 265 0
Subordinated debt extension fees added to debt 680 680
Fair value of warrants issued to subordinated debt holders 916 1,278
Fair value of warrants issued to lender for debt issuance costs 0 318
Lender debt extension, waiver, and other fees added to debt 695 0
Cumulative capital expenditures in accounts payable $ 11,152 $ 7,900