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Distribution of Stock-Based Compensation Plan Expense (Tables)
12 Months Ended
Mar. 31, 2016
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,
      2016     2015     2014
Cost of service revenue   $ 1,159    $ 692    $ 372 
Cost of product revenue            
Research and development     2,914      1,495      967 
Sales and marketing     6,133      3,748      2,217 
General and administrative     6,128      3,412      4,039 
Total stock-based compensation expense                  
     related to employee stock options                   
     and employee stock purchases, pre-tax     16,334      9,347      7,595 
Tax benefit            
Stock based compensation expense related to                   
     employee stock options and employee                   
     stock purchases, net of tax   $ 16,334    $ 9,347    $ 7,595