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BUSINESS COMBINATIONS - Fair Value of Consideration Transferred (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 02, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Contingent consideration   $ (115) $ (7,212) $ 5,200
ABILITY Network        
Business Acquisition [Line Items]        
Cash $ 1,107,220      
Issuance of Class A common stock 70,000      
Contingent consideration 14,460      
Working capital adjustment (630)      
Total fair value purchase price $ 1,191,050