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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Summary of Effect of Foreign Exchange Forward Contracts on Other Comprehensive Income and Results of Operations (Details) - USD ($)
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Reclassified gain (loss) as a result of discontinuance of cash flow hedges $ 0 $ 0
Forward contracts | Cash flow hedges | Designated as hedging instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in OCI on Derivative (519,000) 494,000
Gain (Loss) Reclassified from Accumulated OCI into Income 94,000 12,000
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) (42,000) (25,000)
Forward contracts | Cash flow hedges | Designated as hedging instrument | Research and development    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified from Accumulated OCI into Income 30,000 (28,000)
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) 17,000 3,000
Forward contracts | Cash flow hedges | Designated as hedging instrument | Sales and marketing    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified from Accumulated OCI into Income 64,000 40,000
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) $ (59,000) $ (28,000)