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GOODWILL AND INTANGIBLE ASSETS - Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets $ 1,791 $ 1,247
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets 799 546
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets 930 701
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Amortization of intangible assets $ 62 $ 0