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GOODWILL AND INTANGIBLE ASSETS - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 80  
2022 310  
2023 280  
2024 280  
2025 210  
Net Carrying Amount $ 1,160 $ 1,400