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BUSINESS COMBINATIONS - Acquisition of Avanxo (Details)
$ in Thousands
Feb. 01, 2019
USD ($)
shares
Jan. 17, 2019
USD ($)
installment
Dec. 31, 2019
USD ($)
May 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about business combination [line items]            
Total consideration paid net of cash and cash equivalents acquired     $ 97,300   $ 4,137 $ 19,149
Cash paid     103,978   $ 4,328 $ 21,300
Avanxo            
Disclosure of detailed information about business combination [line items]            
Total consideration paid net of cash and cash equivalents acquired $ 44,302 $ 44,460 $ 44,302      
Cash paid 42,144     $ 1,205    
Down payment 40,939          
Contingent consideration 2,158          
Number of installments | installment   2        
Total consideration paid through issuance and delivery of common shares $ 865          
Earn-out payment, percentage 25.00%          
Contingent liabilities recognised in business combination   $ 2,318        
Consideration payment to be expensed   $ 5,300        
Period prior to closing of each share subscription   60 days        
Lock-up period of common share issued pursuant to exercise option   12 months        
Common stock, shares subscribed (in shares) | shares 14,778          
Common stock, value, subscriptions $ 845          
Major business combination | Avanxo            
Disclosure of detailed information about business combination [line items]            
Contingent consideration   $ 7,618