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Supplemental Financial Information | 9 Months Ended
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Sep. 30, 2021
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 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. Spare parts include critical spares required to support plant operations. Parts and supply costs are determined using the lower of cost or estimated replacement cost. Parts are recorded as maintenance expenses in the period in which they are consumed. 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. The Company performs an evaluation of the recoverability of the carrying value of mine development costs to determine if facts and circumstances indicate that their carrying value may be impaired and if any adjustment is warranted. There were no indicators of impairment as of September 30, 2021. Mine reclamation asset, net represents an asset retirement obligation ("ARO") asset related to the Five Forks Mine and is depreciated over the estimated life of the Five Forks Mine. The Company holds a long-term investment (the "Highview Investment") in Highview Enterprises Limited ("Highview"), a UK-based developmental stage company specializing in power storage. The Company accounts for the Highview Investment as an investment recorded at cost, less impairment, plus or minus observable changes in price for identical or similar investments of the same issuer. The Highview Investment is evaluated for indicators of impairment such as an event or change in circumstances that may have a significant adverse effect on the fair value of the investment. There were no changes to the carrying value of the Highview Investment for the three and nine months ended September 30, 2021 as there were no indicators of impairment or observable price changes for identical or similar investments. 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 |
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 |
As discussed in Note 4, as of June 30, 2021, the Company reduced the Mine reclamation liability related to Marshall Mine by $1.9 million based on scope reductions for future reclamation requirements. The Company recorded a corresponding gain on change in estimate, which is included in the Condensed Consolidated Statements of Operations for the nine months ended September 30, 2021. Supplemental Condensed Consolidated Statements of Operations Information 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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