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Supplemental Financial Information (Tables) | 9 Months Ended
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Sep. 30, 2024
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) | September 30, 2024 |  | December 31, 2023
Prepaid expenses and other current assets: |  |  |  |
Prepaid expenses |  | $ | 1,317 |  |  | $ | 2,430 |
Prepaid income taxes and income tax refunds |  | 192 |  |  | 349 |
Other |  | 2,021 |  |  | 2,436 |
Total prepaid expenses and other current assets |  | $ | 3,530 |  |  | $ | 5,215 |
Other long-term assets, net: |  |  |  |
Spare parts, net |  | $ | 10,753 |  |  | $ | 9,147 |
Right of use assets, operating leases, net |  | 9,331 |  |  | 10,592 |
Intangible assets, net |  | 7,644 |  |  | 7,899 |
Mine development costs, net |  | 7,125 |  |  | 7,377 |
Upfront Customer Consideration (1) |  | 5,586 |  |  | 5,967 |
Mine reclamation asset, net |  | 1,856 |  |  | 1,955 |
Other |  | 2,546 |  |  | 2,663 |
Total other long-term assets, net |  | $ | 44,841 |  |  | $ | 45,600 |
(1) Represents remaining balance on consideration paid to a customer under a 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) |  | September 30, 2024 |  | December 31, 2023
Other current liabilities: |  |  |  |
Current portion of operating lease obligations |  | $ | 1,991 |  |  | $ | 1,944 |
Sales, use and other taxes payable |  | 1,719 |  |  | 948 |
Current portion of asset retirement obligations |  | 1,259 |  |  | 182 |
Other(1) |  | 2,702 |  |  | 2,718 |
Total other current liabilities |  | $ | 7,671 |  |  | $ | 5,792 |
Other long-term liabilities: |  |  |  |
Operating lease obligations, long-term |  | $ | 7,569 |  |  | $ | 8,870 |
Asset retirement obligations |  | 5,335 |  |  | 5,981 |
Other |  | 1,125 |  |  | 929 |
Total other long-term liabilities |  | $ | 14,029 |  |  | $ | 15,780 |
(1) Included in Other current liabilities as of September 30, 2024 and December 31, 2023 is $1.7 million for the Tinuum Group Obligation as discussed in Note 7.
Schedule of Change in Asset Retirement Obligation |
|  | As of
(in thousands) |  | September 30, 2024 |  | December 31, 2023
Asset retirement obligations, beginning of period |  | $ | 6,163 |  |  | $ | 8,533 |
Asset retirement obligations assumed(1) |  | — |  |  | 1,500 |
Accretion |  | 496 |  |  | 582 |
Liabilities settled(2) |  | (65) |  |  | (4,866) |
Changes due to scope and timing of reclamation |  | — |  |  | 414 |
Asset retirement obligations, end of period |  | 6,594 |  |  | 6,163 |
Less current portion |  | 1,259 |  |  | 182 |
Asset retirement obligations, long-term |  | $ | 5,335 |  |  | $ | 5,981 |
(1) Represents the Corbin ARO and Mine 4 ARO in the amounts of $0.5 million and $1.0 million, respectively, assumed during the period ended December 31, 2023. (2) Included in liabilities settled during the period ended December 31, 2023 is $4.7 million related to the removal of the ARO associated with Marshall Mine, LLC as a result of the sale of Marshall Mine, LLC in March 2023.

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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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