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Acquisition of Marshall Mine - Allocation (Details) - Marshall Mine - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020
Assets acquired: |  |
Receivables | $ 0 | $ 513
Property, plant and equipment | 3,863 | 3,863
Spare parts | 100 | 100
Liabilities assumed: |  |
Accounts payable and accrued expenses | (673) | (513)
Asset retirement obligation | (21,328) | (21,328)
Net assets acquired and liabilities assumed from Marshall Mine acquisition | (18,038) | (17,365)
Cabot Receivable | 9,749 | 9,749
Upfront Customer Consideration | $ 8,289 | 7,616
Adjustments |  |
Receivables |  | 513
Property, plant and equipment |  | 0
Spare parts |  | 0
Accounts payable and accrued expenses |  | 160
Asset retirement obligation |  | 0
Net assets acquired and liabilities assumed from Marshall Mine acquisition |  | 673
Cabot Receivable |  | 0
Upfront Customer Consideration |  | $ (673)

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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