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RELATED PARTY TRANSACTIONS (Details) - Co-venturer - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Purchases from related party $ 529 $ 264 $ 646 $ 850  
Due to related parties $ 75   $ 75   $ 38