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Supplemental Financial Information (Tables)

9 Months Ended

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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- References

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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.

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Tabular disclosure of other liabilities.

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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

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