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GOODWILL AND OTHER INTANGIBLE ASSETS - Change in Carrying Amount of Goodwill (Details) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 9 Months Ended
May 31, 2019
Sep. 30, 2019
Sep. 30, 2018
May 31, 2019
Goodwill [Roll Forward]        
Balance as of January 1,   $ 72,858    
Acquisition   6,179    
Currency translation adjustments   (175)    
Balance as of March 31,   78,862    
Business Acquisition [Line Items]        
Payments for acquisitions, net of cash acquired   10,934 $ 0  
Goodwill   $ 72,858    
In the Chat Communications Inc.        
Goodwill [Roll Forward]        
Balance as of March 31, $ 6,200      
Business Acquisition [Line Items]        
Payments for acquisitions, net of cash acquired $ 10,900      
Number of shares the company expects to issue upon specified retention milestones (in shares) 15      
Goodwill $ 6,200     $ 6,200
Technology | In the Chat Communications Inc.        
Business Acquisition [Line Items]        
Technology intangible assets acquired       $ 5,100