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BUSINESS COMBINATIONS - Acquisition of Clarice Technologies (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 14, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
shares
Feb. 23, 2017
USD ($)
Jul. 15, 2016
USD ($)
shares
May 23, 2016
May 14, 2015
USD ($)
shares
Disclosure of detailed information about business combination [line items]                      
Number of employees                   40  
Total consideration paid net of cash and cash equivalents acquired $ 97,300 $ 4,137 $ 19,149                
Cash transferred 103,978 4,328 21,300                
Loss on remeasurement of contingent consideration 85 (6,700) (6,735)                
Clarice                      
Disclosure of detailed information about business combination [line items]                      
Number of employees                     337
Total consideration paid net of cash and cash equivalents acquired                     $ 20,184
Business acquisition, number of shares acquired (in shares) | shares           550 920   1,249   10,200
Percentage of voting equity interests acquired           4.11% 6.87%   9.32%   76.13%
Cash transferred           $ 3,135 $ 3,128   $ 4,208   $ 9,324
Business combination, percentage of voting interest acquired, staggered                     23.87%
Business combination, gain (loss) on remeasurement of purchase price       $ 418              
Contingent consideration                     $ 8,377
Business combination, percentage of voting interest acquired, total                     100.00%
Loss on remeasurement of contingent consideration $ 3 $ 0 $ 1,173                
Clarice | Acquiree Employee                      
Disclosure of detailed information about business combination [line items]                      
Cash transferred               $ 600      
Clarice | Scenario, Forecast                      
Disclosure of detailed information about business combination [line items]                      
Business acquisition, number of shares acquired (in shares) | shares         277            
Percentage of voting equity interests acquired         2.07%            
Contingent consideration         $ 1,316            
Business combination, share price | $ / shares         $ 971