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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Stock-based compensation expense
Share-Based Compensation. The following table shows total share-based compensation expense included in the consolidated statements of comprehensive income for the three and six months ended September 30, 2017 and 2016:
 
Three Months Ended September 30,
 
Six Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Costs and expenses:
 
 
 
 
 
 
 
Cost of revenue
$
290

 
$
166

 
$
427

 
$
315

Research and development costs, net
513

 
334

 
874

 
417

Selling, general and administrative
2,288

 
1,418

 
3,831

 
2,445

Total share-based compensation
3,091

 
1,918

 
5,132

 
3,177

Income tax benefit
(1,144
)
 
(695
)
 
(1,860
)
 
(1,107
)
Decrease in net income
$
1,947

 
$
1,223

 
$
3,272

 
$
2,070