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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based compensation expense        
Share-based compensation $ 2,447 $ 2,669 $ 5,100 $ 5,737
Stock options        
Share-based compensation expense        
Share-based compensation 0 154 2 311
Restricted stock        
Share-based compensation expense        
Share-based compensation 2,167 2,315 4,597 5,013
Stock purchase plan        
Share-based compensation expense        
Share-based compensation 280 200 501 413
Cost of revenue        
Share-based compensation expense        
Share-based compensation 331 333 693 747
Research and development        
Share-based compensation expense        
Share-based compensation 492 603 1,041 1,383
Sales and marketing        
Share-based compensation expense        
Share-based compensation 839 887 1,709 1,797
General and administrative        
Share-based compensation expense        
Share-based compensation $ 785 $ 846 $ 1,657 $ 1,810