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BUSINESS COMBINATIONS - Consideration Transferred for L4 Acquisition (Details) - USD ($)
Nov. 14, 2016
Dec. 31, 2019
Dec. 31, 2018
Feb. 15, 2018
Dec. 31, 2017
Feb. 15, 2017
Disclosure of detailed information about business combination [line items]            
Cash paid   $ 103,978,000 $ 4,328,000   $ 21,300,000  
Total consideration paid net of cash and cash equivalents acquired   97,300,000 4,137,000   $ 19,149,000  
Contingent consideration            
Disclosure of detailed information about business combination [line items]            
Fair value of contingent consideration   9,252,000 9,767,000      
L4            
Disclosure of detailed information about business combination [line items]            
Cash paid $ 11,000,000     $ 1,850,000   $ 990,000
Working capital adjustment 817,000          
Contingent consideration 8,571,000          
Total consideration paid net of cash and cash equivalents acquired $ 20,388,000          
L4 | Contingent consideration            
Disclosure of detailed information about business combination [line items]            
Fair value of contingent consideration   $ 0 $ 0