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Stock-Based Compensation
 6 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
STOCK-BASED COMPENSATION
STOCK-BASED COMPENSATION
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 September 30,
 
Six Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Employee stock purchase rights
$
315

 
$
289

 
$
642

 
$
496

RSUs
6,374

 
5,650

 
14,221

 
11,547

 
6,689

 
5,939

 
14,863

 
12,043

Stock-based compensation capitalized to inventory
7

 
(5
)
 
(2
)
 
(17
)
Total
$
6,696

 
$
5,934

 
$
14,861

 
$
12,026



Stock-based compensation expense by cost centers:
Three Months Ended September 30,
 
Six Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Cost of revenues
$
165

 
$
121

 
$
332

 
$
226

Research and development
4,530

 
3,955

 
10,523

 
8,015

Selling, general and administrative
1,994

 
1,863

 
4,008

 
3,802

 
6,689

 
5,939

 
14,863

 
12,043

Stock-based compensation capitalized to inventory
7

 
(5
)
 
(2
)
 
(17
)
Total
$
6,696

 
$
5,934

 
$
14,861

 
$
12,026


As of September 30, 2016, the amount of unrecognized stock-based compensation cost related to unvested stock-based awards was $27.3 million which will be recognized over a weighted average period of 1.2 years.