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INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
INTANGIBLE ASSETS      
Total amortization expense $ 500 $ 300  
Accumulated amortization 3,500   $ 3,000
Goodwill $ 19,860 $ 6,000 $ 19,860