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Distribution of Stock-Based Compensation Plan Expense (Tables)
6 Months Ended
Sep. 30, 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):

      Three Months Ended     Six Months Ended
      September 30,     September 30,
      2015     2014     2015     2014
Cost of service revenue   $ 263    $ 160    $ 482    $ 275 
Cost of product revenue                
Research and development     726      315      1,257      629 
Sales and marketing     1,422      910      2,619      1,654 
General and administrative     1,106      623      2,181      1,297 
Total stock-based compensation expense                         
     related to employee stock options and                         
     employee stock purchases, pre-tax     3,517      2,008      6,539      3,855 
                         
Tax benefit                
Stock-based compensation expense                         
     related to employee stock options and                         
     employee stock purchases, net of tax   $ 3,517    $ 2,008    $ 6,539    $ 3,855