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GOODWILL AND INTANGIBLE ASSETS - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Estimated amortization expense    
2021 $ 497  
2022 124  
2023 124  
2024 124  
2025 104  
Intangible assets, net $ 973 $ 1,538