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Distribution of Stock-Based Compensation Plan Expense (Tables)
12 Months Ended
Mar. 31, 2015
Distribution Of Stock-based Compensation Plan Expense Tables  
Schedule Of Stock-Based Compensation Expense By Statement Of Operations Line Item

The following table summarizes stock-based compensation expense (in thousands):

      Years Ended March 31,
      2015     2014     2013
Cost of service revenue   $ 692    $ 372    $ 211 
Cost of product revenue            
Research and development     1,495      967      428 
Sales and marketing     3,748      2,217      1,363 
General and administrative     3,412      4,039      632 
Total stock-based compensation expense                  
     related to employee stock options                   
     and employee stock purchases, pre-tax     9,347      7,595      2,634 
Tax benefit            
Stock based compensation expense related to                   
     employee stock options and employee                   
     stock purchases, net of tax   $ 9,347    $ 7,595    $ 2,634