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Stock-based compensation (Tables)
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
A summary of the Company’s stock option activity and related information is as follows:
 
 
Options outstanding
(shares in thousands)
 
Shares
 
Weighted-
average
exercise
price
 
Weighted-
average
grant
date fair
value
 
Total intrinsic
value of
exercises
(in thousands)
 
Aggregate
intrinsic value
(in thousands)
Outstanding at December 31, 2014:
 
25,134

 
$
6.62

 
 
 
 
 
$
1,425,339

Granted
 
420

 
45.56

 
$
22.47

 
 
 
 
Exercised
 
(4,143
)
 
1.44

 
 
 
$
203,784

 
 
Forfeited/Cancelled
 
(74
)
 
20.91

 
 
 
 
 
 
Outstanding at March 31, 2015:
 
21,337

 
$
8.34

 
 
 
 
 
$
756,135

 
 
 
 
 
 
 
 
 
 
 
Exercisable at March 31, 2015
 
14,678

 
$
2.68

 
 
 
 
 
$
597,831

Vested and expected to vest at March 31, 2015
 
20,966

 
$
8.08

 
 
 
 
 
$
748,068

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of the Company’s RSU activity is as follows:
(shares in thousands)
Shares
 
Weighted- average grant date fair value
Non-vested shares at December 31, 2014
4,307

 
$
21.98

Granted
332

 
46.42

Vested
(817
)
 
15.80

Forfeited
(8
)
 
79.22

Non-vested shares at March 31, 2015
3,814

 
25.30

A summary of the Company’s restricted stock awards is as follows:
(shares in thousands)
Shares
 
Weighted- average grant date fair value
 
Aggregate
intrinsic value
(in thousands)
Non-vested shares at December 31, 2014
17

 
$
6.30

 
$
1,017

Vested
(17
)
 
 
 
 
Non-vested shares at March 31, 2015

 
$

 
$

Allocation of Stock-based Compensation Expense
The following tables set forth the detailed allocation of stock-based compensation expense:
 
Three months ended
(in thousands)
March 31,
2015
 
March 31,
2014
Stock-based compensation expense:
 
 
 
Cost of revenue
$
283

 
$
168

Research and development
3,535

 
1,401

Sales and marketing
3,066

 
1,414

General and administrative
19,617

 
1,054

Total stock-based compensation expense
26,501

 
4,037

Total tax benefit recognized
(9,304
)
 
(342
)
Decrease in net income
$
17,197

 
$
3,695

 
 
 
 
Stock-based compensation expense by type of award:
 
 
 
Stock options
$
5,957

 
$
2,894

RSUs
18,920

 
179

RSAs
566

 
964

ESPP
1,058

 

Total stock-based compensation expense
$
26,501

 
$
4,037