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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based compensation expense        
Share-based compensation $ 1,717 $ 1,650 $ 3,330 $ 3,648
Restricted stock units        
Share-based compensation expense        
Share-based compensation 1,559 1,511 3,020 3,347
Stock purchase plan        
Share-based compensation expense        
Share-based compensation 158 139 310 301
Cost of revenue        
Share-based compensation expense        
Share-based compensation 201 234 418 514
Research and development        
Share-based compensation expense        
Share-based compensation 245 333 531 736
Sales and marketing        
Share-based compensation expense        
Share-based compensation 633 606 1,153 1,218
General and administrative        
Share-based compensation expense        
Share-based compensation $ 638 $ 477 $ 1,228 $ 1,180