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GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Beginning balance $ 24,783 $ 24,783
Goodwill acquired 36,177 0
Currency translation adjustment 78 0
Ending balance $ 61,038 $ 24,783