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Net income per share attributable to common stockholders (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Net Income per Share, Basic and Diluted
The following table presents the calculations of basic and diluted net income per share attributable to common stockholders:
 
Three months ended 
 September 30,
 
Nine months ended 
 September 30,
(in thousands, except per share data)
2015
 
2014
 
2015
 
2014
 
Class A
 
Class B
 
Class A
 
Class B
 
Class A
 
Class B
 
Class A
 
Class B
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allocation of net income
$
13,849

 
$
4,950

 
$
2,395

 
$
12,225

 
$
46,561

 
$
24,021

 
$
417

 
$
5,411

Less: net income allocable to participating securities
—

 
—

 
(6
)
 
(30
)
 
—

 
—

 
(73
)
 
(949
)
Net income attributable to common stockholders—basic
13,849

 
4,950

 
2,389

 
12,195

 
46,561

 
24,021

 
344

 
4,462

Add: net income allocable to dilutive participating securities
—

 
—

 
1

 
4

 
—

 
—

 
10

 
130

Reallocation of net income as a result of conversion of Class B to Class A shares
4,950

 

 
12,195

 
—

 
24,021

 

 
4,462

 
—

Reallocation of net income to Class B shares
—

 
960

 
—

 
—

 
—

 
4,215

 
—

 
—

Net income attributable to common stockholders—diluted
$
18,799

 
$
5,910

 
$
14,585

 
$
12,199

 
$
70,582

 
$
28,236

 
$
4,816

 
$
4,592

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares—basic
100,040

 
35,760

 
20,597

 
105,116

 
88,234

 
45,521

 
6,941

 
89,964

Conversion of Class B to Class A common stock outstanding
35,760

 
—

 
105,116

 
—

 
45,521

 
—

 
89,964

 
—

Effect of potentially dilutive shares
10,255

 
10,159

 
19,473

 
19,317

 
13,446

 
13,366

 
18,673

 
18,621

Weighted-average common shares—diluted
146,055

 
45,919

 
145,186

 
124,433

 
147,201

 
58,887

 
115,578

 
108,585

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income per share attributable to common stockholders:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.14

 
$
0.14

 
$
0.12

 
$
0.12

 
$
0.53

 
$
0.53

 
$
0.05

 
$
0.05

Diluted
$
0.13

 
$
0.13

 
$
0.10

 
$
0.10

 
$
0.48

 
$
0.48

 
$
0.04

 
$
0.04
Schedule of Antidilutive Securities Excluded from Computation of Net Income per Share
The following potentially dilutive shares were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:
 
Three months ended 
 September 30,
 
Nine months ended 
 September 30,
(in thousands)
2015
 
2014
 
2015
 
2014
Redeemable convertible preferred stock
—

 
—

 
—

 
20,237

Stock options, ESPP shares, and RSUs
2,373

 
366

 
1,993

 
2,871

Unvested restricted stock awards
—

 
308

 
2

 
376

 
2,373

 
674

 
1,995

 
23,484