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RELATED PARTY TRANSACTIONS (Details) - Co-venturer - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Purchases from related party $ 456 $ 410 $ 1,102 $ 1,250  
Due to related parties $ 48   $ 48   $ 38