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STOCK PLANS (Tables)
 12 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary of Share-Based Compensation Expense
The following is a summary of share-based compensation expense including restricted stock units and employee stock purchases made under our employee stock purchase plan (ESPP) based on estimated fair values within the applicable cost and expense lines identified below (in thousands):
 
Year Ended March 31,
 
2015
 
2014
 
2013
Cost of product revenue
$
338

 
$
228

 
$
235

Cost of service revenue
1,194

 
741

 
342

Research and development
5,505

 
4,361

 
2,944

Sales and marketing
4,841

 
3,791

 
3,035

General and administrative
4,702

 
3,809

 
3,024

 
$
16,580

 
$
12,930

 
$
9,580
Summary of Transactions under 1999 Stock Option Plan and 2007 Equity Incentive Plan
Transactions under the 1999 Stock Option Plan and the 2007 Equity Incentive Plan during the fiscal years ended March 31, 2015, 2014 and 2013 are summarized in the table below. The Company has revised the weighted average fair values, the aggregate intrinsic value of options exercised and the aggregated fair values of restricted stock units vested for fiscal years 2013 and 2014. These revisions correct immaterial errors identified within those tables.
 
Stock Options
 
Restricted Stock Units
 
Number of
Shares
 
Weighted
Average
Exercise
Price
 
Number of
Awards
 
Weighted
Average
Fair Value
Outstanding – March 31, 2012
240,892

 
$
6.63

 
1,755,325

 
$
13.33

Granted
—

 
—

 
764,893

 
24.15

Exercised (Options)/Issued (RSU’s)
(86,892
)
 
6.62

 
(549,932
)
 
13.76

Canceled
0

 
0.00

 
(99,460
)
 
16.85

Outstanding – March 31, 2013
154,000

 
$
6.63

 
1,870,826

 
$
18.09

Granted
—

 
—

 
602,359

 
25.75

Exercised (Options)/Issued (RSU’s)
(117,650
)
 
6.91

 
(635,254
)
 
17.14

Canceled
(5,000
)
 
3.76

 
(99,632
)
 
17.61

Outstanding – March 31, 2014
31,350

 
$
5.87

 
1,738,299

 
$
21.11

Granted
—

 
—

 
1,009,770

 
36.92

Exercised (Options)/Issued (RSU’s)
(23,850
)
 
5.87

 
(728,239
)
 
18.97

Canceled
(7,500
)
 
5.87

 
(90,515
)
 
21.44

Outstanding – March 31, 2015
—

 
$
—

 
1,929,315

 
$
30.18
Schedule of Aggregate Intrinsic Values of Stock Options and Restricted Stock Units
The aggregate intrinsic value of stock options exercised and the fair value of restricted stock units vested at March 31, 2015, 2014 and 2013 were as follows (in thousands):
 
Year Ended March 31,
  
2015
 
2014
 
2013
Total intrinsic value of stock options exercised
$
800

 
$
2,375

 
$
1,564

Total fair value of restricted stock unit awards vested
$
31,651

 
$
16,104

 
$
12,814