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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities    
Net loss $ (1,930) $ (5,387)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, amortization, depletion and accretion 4,666 3,374
Stock-based compensation expense 1,470 1,435
Operating lease expense 1,161 1,049
Amortization of debt discount and debt issuance costs 173 299
Loss on sale of long-term assets, net 118 0
Earnings from equity method investments (155) 0
Other non-cash items, net (5) (55)
Changes in operating assets and liabilities:    
Receivables, net (671) 380
Prepaid expenses and other assets (2,853) 1,036
Inventories, net (1,580) (1,493)
Other long-term assets, net (1,631) (1,089)
Accounts payable and accrued expenses (5,709) (1,821)
Other current liabilities 1,651 1,560
Operating lease liabilities 204 (786)
Other long-term liabilities (185) (926)
Net cash used in operating activities (5,276) (2,424)
Cash flows from investing activities    
Acquisition of property, plant, equipment and intangible assets, net (5,589) (28,766)
Acquisition of mine development costs (96) (85)
Distributions from equity method investees in excess of cumulative earnings 155 0
Net cash used in investing activities (5,530) (28,851)
Cash flows from financing activities    
Borrowings on revolving credit facility 61,884 0
Repayments of revolving credit facility (57,184) 0
Principal payments on notes payable (393) (268)
Principal payments on finance lease obligations (264) (565)
Repurchase of common stock to satisfy tax withholdings (48) (599)
Net proceeds from common stock issued in private placement transactions 0 14,951
Net cash provided by financing activities 3,995 14,319
Decrease in Cash and Restricted Cash (6,811) (16,956)
Cash and Restricted Cash, beginning of period 22,235 54,153
Cash and Restricted Cash, end of period 15,424 37,197
Supplemental disclosure of non-cash investing and financing activities:    
Change in accrued purchases for property and equipment 553 4,013
Related Party    
Cash flows from financing activities    
Net proceeds from common stock issued to related party $ 0 $ 800