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BUSINESS COMBINATIONS - Fair Value of Consideration Transferred (Details) - USD ($)
$ in Thousands
9 Months Ended
Apr. 02, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]      
Contingent consideration   $ (67) $ (9,364)
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