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
Jun. 30, 2015
Jun. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation $ 2,653 $ 3,068
Stock options    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation 2 157
Restricted stock    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation 2,430 2,698
Stock purchase plan    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation 221 213
Cost of revenue    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation 362 414
Research and development    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation 549 780
Sales and marketing    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation 870 910
General and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation $ 872 $ 964