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Supplemental Financial Information (Tables)

9 Months Ended

Sep. 30, 2021

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Prepaid Expenses and Other Assets and Other assets

The following table summarizes the components of Prepaid expenses and other assets and Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets:

						As of
(in thousands)						September 30, 2021						December 31, 2020
Prepaid expenses and other assets:
Prepaid expenses						$	2,370					$	1,690
Prepaid income taxes and income tax refunds						1,038						1,605
Other						1,206						1,302
						$	4,614					$	4,597
Other long-term assets, net:
Cabot Receivable (1)						$	6,812					$	8,852
Upfront Customer Consideration (1)						7,109						7,490
Mine development costs, net						5,291						4,338
Right of use assets, operating leases, net						6,399						1,930
Spare parts, net						4,316						3,727
Mine reclamation asset, net						1,644						1,712
Highview Investment						552						552
Other						1,278						1,388
						$	33,401					$	29,989

(1) See further discussion of Upfront Customer Consideration in Note 3 and Cabot Receivable in Note 4 and Note 10.

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, 2021						December 31, 2020
Other current liabilities:
Current portion of operating lease obligations						$	2,289					$	1,883
Current portion of mine reclamation liability						4,856						9,370
Income and other taxes payable						2,409						1,305
Other current liabilities						312						438
						$	9,866					$	12,996
Other long-term liabilities:
Mine reclamation liabilities						$	8,028					$	12,077
Operating lease obligations, long-term						4,582						1,109
Other long-term liabilities						208						287
						$	12,818					$	13,473

Schedule of Change in Asset Retirement Obligation

The Mine reclamation liability related to the Five Forks Mine is included in Other long-term liabilities. The Mine reclamation liability related to Marshall Mine, which was assumed in the Marshall Mine Acquisition, is included in Other current liabilities and Other long-term liabilities. The Mine reclamation liabilities represent AROs. Changes in the AROs were as follows:

						As of
(in thousands)						September 30, 2021						December 31, 2020
Asset retirement obligation, beginning of period						$	21,447					$	2,721
Asset retirement obligation assumed						—						21,328
Accretion						901						543
Liabilities settled						(7,522)						(3,565)
Changes due to scope and timing of reclamation						(1,942)						420
Asset retirement obligations, end of period						12,884						21,447
Less current portion						4,856						9,370
Asset retirement obligation, long-term						$	8,028					$	12,077

Schedule of Statement of Operations, Supplemental Disclosures

The following table details the components of Interest expense in the Condensed Consolidated Statements of Operations:

						Three Months Ended September 30,												Nine Months Ended September 30,
(in thousands)						2021						2020						2021						2020
Interest on Senior Term Loan						$	—					$	339					$	207					$	1,453
Debt discount and debt issuance costs						—						355						946						1,064
453A interest						3						94						10						254
Other						83						93						253						282
						$	86					$	881					$	1,416					$	3,053

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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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