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TAXES - Unrecognized Tax Benefits (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
TAXES      
Interest expense or penalties for uncertain tax positions recorded $ 0 $ 0 $ 0
Liability for uncertain tax positions recorded 0 $ 0 $ 0
Change in uncertain tax positions, increase $ 0