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BUSINESS COMBINATIONS - Acquisition of 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
BI Live        
Disclosure of detailed information about business combination [line items]        
Cash paid   $ 366    
Contingent liabilities recognised in business combination $ 559 $ 3,000