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Supplemental Financial Information | 6 Months Ended
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Jun. 30, 2025
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Supplemental Financial Information | Supplemental Financial Information Supplemental Balance Sheet Information 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. Spare parts include critical spares required to support plant operations. Mine development costs include acquisition costs, the cost of other development work and mitigation costs related to the Five Forks Mine and are depleted over the estimated life of the related mine reserves. Mine reclamation asset, net represents an asset retirement obligation ("ARO") asset related to the Five Forks Mine and is depreciated over its estimated life. As of June 30, 2025 and December 31, 2024, Other includes the Highview Investment in the amount of $0.6 million that is carried at cost, less impairment, plus or minus observable changes in price for identical or similar investments of the same issuer. 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. As of June 30, 2025 and December 31, 2024, the ARO related to the Five Forks Mine is included in Other long-term liabilities. 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 |
Supplemental Income Statement Information Tinuum Group, LLC As of June 30, 2025 and December 31, 2024, the Company's ownership interest in Tinuum Group, an equity method investment, was 42.5%. For the three and six months ended June 30, 2025, the Company recognized earnings from Tinuum Group of zero and $0.2 million, respectively. In 2025, Tinuum Group, LLC has continued to wind down its operations. For the three and six months ended June 30, 2025, the Company recognized expense of $0.2 million in Cost of revenue, exclusive of depreciation and amortization, related to royalties owed to Tinuum Group under an agreement for certain of the Company's sales of M-Prove TM products. For the three and six months ended June 30, 2024, the Company recognized expense of $0.3 million and $0.5 million, respectively, in Cost of revenue, exclusive of depreciation and amortization, related to royalties owed to Tinuum Group under an agreement for certain of the Company's sales of M-Prove TM products.

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