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GOODWILL AND INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 113,600 $ 113,600
Accumulated amortization (85,008) (69,072)
Total finite-lived intangible assets, net 28,592 44,528
Developed technology (Software, net)    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 54,000 54,000
Accumulated amortization (49,625) (43,383)
Total finite-lived intangible assets, net 4,375 10,617
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 35,800 35,800
Accumulated amortization (26,128) (20,400)
Total finite-lived intangible assets, net 9,672 15,400
Publisher relationship    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 23,800 23,800
Accumulated amortization (9,255) (5,289)
Total finite-lived intangible assets, net $ 14,545 $ 18,511