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EQUITY-METHOD INVESTMENT (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) vote | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Percentage of operating expenses to be absorbed |  |  | 66.66% |  |
Percentage of production offtake |  |  | 66.66% |  |
St. Gabriel CC Company, LLC |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Ownership percentage in joint venture | 66.66% |  | 66.66% |  |
Number of votes | vote |  |  | 2 |  |
Loss relating to joint venture's expenses | $ 130 | $ 142 | $ 274 | $ 280 |
Net return of capital | (28) |  | (15) |  |
Capital contribution to investment |  | $ 131 |  | $ 798 |
Carrying value of joint venture | $ 4,682 |  | $ 4,682 |  | $ 4,971
St. Gabriel CC Company, LLC | Eastman Chemical Company |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Ownership percentage in joint venture | 33.34% |  | 33.34% |  |
Number of votes | vote |  |  | 2 |  |

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