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BUSINESS COMBINATIONS - Consideration Transferred For BI Live (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Nov. 11, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about business combination [line items]        
Cash paid $ 103,978   $ 4,328 $ 21,300
Total consideration paid net of cash and cash equivalents acquired 97,300   4,137 $ 19,149
Other financial liabilities 1,617   3,418  
Contingent consideration        
Disclosure of detailed information about business combination [line items]        
Fair value of contingent consideration 9,252   9,767  
BI Live        
Disclosure of detailed information about business combination [line items]        
Cash paid   $ 366    
Contingent consideration   512    
Total consideration paid net of cash and cash equivalents acquired 878 $ 878    
Other financial liabilities 515   $ 0  
BI Live | Contingent consideration        
Disclosure of detailed information about business combination [line items]        
Fair value of contingent consideration $ 512