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Stock-Based Compensation (Tables)
 3 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Assumptions Used
The Company did not grant options or employee stock purchase rights during the three months ended June 30, 2015 and 2014.
Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units
The following tables summarize the allocation of the stock-based compensation expense (in thousands):
 
Stock-based compensation expense by type of grant:
Three months ended June 30,
 
2015
 
2014
Stock options and stock purchase rights
$
207

 
$
414

RSUs
5,897

 
4,784

 
6,104

 
5,198

Stock-based compensation (capitalized to) expensed from inventory
(12
)
 
18

Total stock-based compensation expense
$
6,092

 
$
5,216
Summary of Stock-Based Compensation Expense

Stock-based compensation expense by cost centers:
Three months ended June 30,
 
2015
 
2014
Cost of revenues
$
105

 
$
29

Research and development
4,060

 
3,271

Selling, general and administrative
1,939

 
1,898

 
$
6,104

 
$
5,198

Stock-based compensation (capitalized to) expensed from inventory
(12
)
 
18

Total stock-based compensation expense
$
6,092

 
$
5,216