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 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Share-based compensation expense        
Share-based compensation $ 1,476 $ 2,239 $ 5,124 $ 7,339
Stock options        
Share-based compensation expense        
Share-based compensation 0 0 0 2
Restricted stock units        
Share-based compensation expense        
Share-based compensation 1,437 1,955 4,784 6,552
Stock purchase plan        
Share-based compensation expense        
Share-based compensation 39 284 340 785
Cost of revenue        
Share-based compensation expense        
Share-based compensation 183 313 697 1,006
Research and development        
Share-based compensation expense        
Share-based compensation 284 488 1,020 1,529
Sales and marketing        
Share-based compensation expense        
Share-based compensation 542 658 1,760 2,367
General and administrative        
Share-based compensation expense        
Share-based compensation $ 467 $ 780 $ 1,647 $ 2,437