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Stockholders' equity (Tables)
9 Months Ended
Sep. 30, 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
 
Aggregate
intrinsic value
(in thousands)
Outstanding at December 31, 2014:
 
25,134

 
$
6.62

 
$
1,425,339

Granted
 
527

 
47.37

 
 
Exercised
 
(12,027
)
 
1.97

 
 
Forfeited/Cancelled
 
(249
)
 
18.65

 
 
Outstanding at September 30, 2015:
 
13,385

 
$
12.19

 
$
276,067

 
 
 
 
 
 
 
Exercisable at September 30, 2015
 
8,258

 
$
5.48

 
$
214,083

Vested and expected to vest at September 30, 2015
 
13,127

 
$
11.94

 
$
273,232

Schedule of Share-based Compensation, Restricted Stock Units Award 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
1,525

 
52.93

Vested
(1,372
)
 
16.53

Forfeited
(52
)
 
69.51

Non-vested shares at September 30, 2015
4,408

 
$
33.82

Allocation of Stock-based Compensation Expense
Total stock-based compensation expense recognized was as follows:
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2015
 
September 30,
2014
 
September 30,
2015
 
September 30,
2014
Stock-based compensation expense:
 
 
 
 
 
 
 
Cost of revenue
$
410

 
$
233

 
$
1,043

 
$
555

Research and development
4,872

 
2,428

 
12,117

 
5,486

Sales and marketing
3,516

 
3,225

 
9,514

 
6,293

General and administrative
9,072

 
8,027

 
39,886

 
39,809

Total stock-based compensation expense
17,870

 
13,913

 
62,560

 
52,143

Total tax benefit recognized
(7,323
)
 
(2,949
)
 
(22,867
)
 
(14,774
)
Decrease in net income
$
10,547

 
$
10,964

 
$
39,693

 
$
37,369