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Distribution of Stock-Based Compensation Plan Expense (Tables)
12 Months Ended
Mar. 31, 2013
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,
      2013     2012     2011
Cost of service revenue   $ 211    $ 129    $ 50 
Cost of product revenue            
Research and development     428      260      111 
Sales and marketing     1,363      859      192 
General and administrative     632      258      105 
Total stock-based compensation expense                  
     related to employee stock options                   
     and employee stock purchases, pre-tax     2,634      1,506      458 
Tax benefit            
Stock based compensation expense related to                   
     employee stock options and employee                   
     stock purchases, net of tax   $ 2,634    $ 1,506    $ 458