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ACQUISITIONS - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
business
Jul. 31, 2020
USD ($)
Jan. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]            
Contingent purchase obligation $ 3,880     $ 3,880   $ 0
2020 Acquisition            
Business Acquisition [Line Items]            
Intangibles       11,853    
July 2020            
Business Acquisition [Line Items]            
Purchase price   $ 4,250        
Contingent purchase obligation 3,880     3,880 $ 2,745  
December 2020            
Business Acquisition [Line Items]            
Purchase price $ 8,212          
Number of businesses acquired | business 2          
Payments to acquire business $ 7,365          
Promissory note $ 847          
January 2020            
Business Acquisition [Line Items]            
Asset acquisition, purchase price     $ 2,153      
Cash payments for asset acquisition     1,724      
Custodial hold back     99      
Promissory note     $ 330      
Customer Relationships | 2020 Acquisition            
Business Acquisition [Line Items]            
Intangibles       9,753    
Developed Technology | 2020 Acquisition            
Business Acquisition [Line Items]            
Intangibles       2,000    
Trade Names | 2020 Acquisition            
Business Acquisition [Line Items]            
Intangibles       $ 100