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PROPERTY, PLANT AND EQUIPMENT - Impairment of Property, Plant and Equipment (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 22, 2021 a
Property, Plant and Equipment [Line Items] |  |  |  |
Land grant |  | $ 1,378 |  |
Impairment | $ 5,200 | 0 | $ 5,200 |
Alabama Graphite |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Acres of land under lease | a |  |  |  | 70
Term of lease |  |  |  | 10 years
Land grant |  | $ 1,400 |  |
Kingsville Dome project |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment |  |  | 101 |
Rosita Project |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment |  |  | 1,161 |
Cebolleta/Juan Tafoya Property |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment |  |  | $ 3,938 |

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- Definition Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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