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Supplemental Financial Information (Tables) | 6 Months Ended
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Jun. 30, 2025
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Schedule of Other Long Term Assets | The following table summarizes the components of Prepaid expenses and other current assets and Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets:
|  | As of
(in thousands) | June 30, 2025 |  | December 31, 2024
Prepaid expenses and other current assets: |  |  |  |
Prepaid expenses |  | $ | 4,309 |  |  | $ | 2,021 |
Prepaid lender fees, net (1) |  | 1,571 |  |  | 982 |
Prepaid income taxes and income tax refunds |  | 159 |  |  | 233 |
Other |  | 1,343 |  |  | 1,414 |
Total prepaid expenses and other current assets |  | $ | 7,382 |  |  | $ | 4,650 |
Other long-term assets, net: |  |  |  |
Spare parts, net |  | $ | 11,678 |  |  | $ | 11,178 |
Right of use assets, operating leases, net |  | 9,516 |  |  | 9,312 |
Intangible assets, net |  | 7,376 |  |  | 7,569 |
Mine development costs, net |  | 6,851 |  |  | 7,010 |
Upfront Customer Consideration (2) |  | 5,205 |  |  | 5,459 |
Mine reclamation asset, net |  | 1,562 |  |  | 1,620 |
Other |  | 2,601 |  |  | 2,581 |
Total other long-term assets, net |  | $ | 44,789 |  |  | $ | 44,729 |
(1) Represents legal and administrative costs incurred to obtain the Revolving Credit Facility. This asset is being amortized on a straight-line basis over the five-year contractual period of the Revolving Credit Facility. (2) Represents remaining balance on consideration paid to a customer under a long-term supply contract executed in 2020. This asset is being amortized as a reduction to revenue on a straight-line basis over the expected 15-year contractual period of the contract.
Schedule of Other Liabilities | The following table details the components of Other current liabilities and Other long-term liabilities as presented in the Condensed Consolidated Balance Sheets:
|  | As of
(in thousands) |  | June 30, 2025 |  | December 31, 2024
Other current liabilities: |  |  |  |
Current portion of operating lease obligations |  | $ | 2,560 |  |  | $ | 2,081 |
Sales, use and other taxes payable |  | 1,485 |  |  | 2,325 |
Current portion of mine reclamation liability |  | 1,037 |  |  | 1,037 |
Other (1) |  | 5,268 |  |  | 2,741 |
Total other current liabilities |  | $ | 10,350 |  |  | $ | 8,184 |
Other long-term liabilities: |  |  |  |
Operating lease obligations, long-term |  | $ | 7,186 |  |  | $ | 7,460 |
Mine reclamation liabilities |  | 5,413 |  |  | 5,242 |
Other |  | 265 |  |  | 367 |
Total other long-term liabilities |  | $ | 12,864 |  |  | $ | 13,069 |
(1) Included in Other current liabilities as of June 30, 2025 and December 31, 2024 is $1.7 million for the Tinuum Group Obligation as discussed in Note 6.
Schedule of Change in Asset Retirement Obligation | The Mine reclamation liabilities represent AROs. Changes in the AROs were as follows:
|  | As of
(in thousands) |  | June 30, 2025 |  | December 31, 2024
Asset retirement obligations, beginning of period |  | $ | 6,279 |  |  | $ | 6,163 |
Accretion |  | 254 |  |  | 666 |
Liabilities settled |  | (83) |  |  | (77) |
Changes due to scope and timing of reclamation |  | — |  |  | (473) |
Asset retirement obligations, end of period |  | 6,450 |  |  | 6,279 |
Less current portion |  | 1,037 |  |  | 1,037 |
Asset retirement obligations, long-term |  | $ | 5,413 |  |  | $ | 5,242 |

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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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