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Employee benefit plans (Tables)
9 Months Ended
Sep. 30, 2016
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 for the nine months ended September 30, 2016 is as follows:
 
Options outstanding
 
Shares (in thousands)
 
Weighted- average
exercise price
 
Weighted-
average
remaining
contractual
term
(in years)
 
Aggregate
intrinsic value
(in thousands)
Outstanding at December 31, 2015:
13,081

 
$
11.82

 
6.70
 
$
108,846

Granted
2,516

 
11.33

 
 
 
 
Exercised
(1,442
)
 
1.53

 
 
 
 
Forfeited/Cancelled
(1,115
)
 
19.61

 
 
 
 
Outstanding at September 30, 2016:
13,040

 
$
12.20

 
6.41
 
$
86,550

 
 
 
 
 
 
 
 
Vested and expected to vest at September 30, 2016
12,803

 
$
12.12

 
6.37
 
$
85,781

Exercisable at September 30, 2016
8,132

 
$
9.28

 
5.51
 
$
73,387

Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of the Company’s RSU activity for the nine months ended September 30, 2016 is as follows:
 
Shares (in thousands)
 
Weighted- average grant date fair value
Non-vested shares at December 31, 2015
4,638

 
$
32.15

Granted
6,912

 
12.15

Vested
(1,229
)
 
26.23

Forfeited
(1,031
)
 
26.10

Non-vested shares at September 30, 2016
9,290

 
$
18.73

Allocation of Stock-based Compensation Expense
The following table summarizes stock-based compensation included in the condensed consolidated statements of operations:
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2016
 
September 30,
2015
 
September 30,
2016

September 30,
2015
Cost of revenue
$
426

 
$
410

 
$
1,195

 
$
1,043

Research and development
8,039

 
4,872

 
21,135

 
12,117

Sales and marketing
3,816

 
3,516

 
10,699

 
9,514

General and administrative
6,185

 
9,072

 
18,572

 
39,886

Total stock-based compensation expense, before income taxes
18,466

 
17,870

 
51,601


62,560

Total tax benefit recognized
(5,573
)
 
(7,323
)
 
(15,723
)

(22,867
)
Total stock-based compensation expense, net of income taxes
$
12,893

 
$
10,547

 
$
35,878


$
39,693