Quarterly report pursuant to Section 13 or 15(d)

STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Summary of Share-based Compensation (Details)

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STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION - Summary of Share-based Compensation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based compensation expense        
Share-based compensation $ 1,650 $ 2,447 $ 3,648 $ 5,100
Stock options        
Share-based compensation expense        
Share-based compensation 0 0 0 2
Restricted stock units        
Share-based compensation expense        
Share-based compensation 1,511 2,167 3,347 4,597
Stock purchase plan        
Share-based compensation expense        
Share-based compensation 139 280 301 501
Cost of revenue        
Share-based compensation expense        
Share-based compensation 234 331 514 693
Research and development        
Share-based compensation expense        
Share-based compensation 333 492 736 1,041
Sales and marketing        
Share-based compensation expense        
Share-based compensation 606 839 1,218 1,709
General and administrative        
Share-based compensation expense        
Share-based compensation $ 477 $ 785 $ 1,180 $ 1,657