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Net income per share attributable to common stockholders (Tables)
 12 Months Ended
Dec. 31, 2014
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:
 
 
 
Year ended December 31,
(in thousands, except per share amounts)
 
2014
 
2013
 
2012
 
 
 
Class A
 
Class B
 
Common
 
Common
Numerator:
 
 
 
 
 
 
 
 
 
Allocation of net income
 
$
16,647

 
$
111,441

 
$
60,578

 
$
32,262

Less: common stock distributed earnings
 
—

 
—

 
—

 
(84,828
)
Less: preferred stock distributed earnings, including accumulated accretion
 
—

 
—

 
—

 
(26,927
)
Less: unvested early exercised options and restricted stock distributed earnings
 
—

 
—

 
—

 
(454
)
Less: undistributed earnings allocable to:
 
 
 
 
 
 
 
 
holders of preferred stock
 
(2,102
)
 
(14,067
)
 
(16,521
)
 
—

holders of unvested early exercised options and restricted stock
 
(45
)
 
(298
)
 
(206
)
 
—

Undistributed net income (loss) attributable to common stockholders—basic
 
$
14,500

 
$
97,076

 
$
43,851

 
$
(79,947
)
Add: adjustments to net income for dilutive securities allocable to:
 
 
 
 
 
 
 
 
holders of preferred stock
 
2,229

 
1,940

 
2,281

 
—

holders of unvested early exercised options and restricted stock
 
48

 
41

 
28

 
—

Reallocation of undistributed earnings as a result of conversion of Class B to Class A
 
97,076

 
—

 
—

 
—

Reallocation of undistributed earnings to Class B shares
 
—

 
2,237

 
—

 
—

Undistributed net income (loss) attributable to common stockholders—diluted
 
$
113,853

 
$
101,294

 
$
46,160

 
$
(79,947
)
Distributed earnings to common stockholders
 
$
—

 
$
—

 
$
—

 
84,828

Denominator:
 
 
 
 
 
 
 
 
Weighted-average common shares—basic
 
13,575

 
90,878

 
81,018

 
74,226

Conversion of Class B to Class A common stock outstanding
 
90,878

 
—

 
—

 
—

Effect of potentially dilutive securities:
 
 
 
 
 
 
 
 
Stock options and RSUs
 
19,177

 
19,115

 
17,923

 
—

Weighted-average common shares—diluted
 
123,630

 
109,993

 
98,941

 
74,226

Net income per share attributable to common stockholders:
 
 
 
 
 
 
 
 
Distributed earnings—basic
 
$
—

 
$
—

 
$
—

 
$
1.15

Undistributed earnings—basic
 
$
1.07

 
$
1.07

 
$
0.54

 
$
(1.08
)
Basic net income per share
 
$
1.07

 
$
1.07

 
$
0.54

 
$
0.07

Distributed earnings—diluted
 
$
—

 
$
—

 
$
—

 
$
1.15

Undistributed earnings—diluted
 
$
0.92

 
$
0.92

 
$
0.47

 
$
(1.08
)
Diluted net income per share
 
 
$
0.92

 
$
0.92

 
$
0.47

 
$
0.07
Schedule of Antidilutive Securities Excluded from Computation of Net Income per Share
 
 
 
Year ended December 31,
(in thousands, except per share amounts)
 
2014
 
2013
 
2012
 
 
 
Class A
 
Class B
 
Common
 
Common
Numerator:
 
 
 
 
 
 
 
 
 
Allocation of net income
 
$
16,647

 
$
111,441

 
$
60,578

 
$
32,262

Less: common stock distributed earnings
 
—

 
—

 
—

 
(84,828
)
Less: preferred stock distributed earnings, including accumulated accretion
 
—

 
—

 
—

 
(26,927
)
Less: unvested early exercised options and restricted stock distributed earnings
 
—

 
—

 
—

 
(454
)
Less: undistributed earnings allocable to:
 
 
 
 
 
 
 
 
holders of preferred stock
 
(2,102
)
 
(14,067
)
 
(16,521
)
 
—

holders of unvested early exercised options and restricted stock
 
(45
)
 
(298
)
 
(206
)
 
—

Undistributed net income (loss) attributable to common stockholders—basic
 
$
14,500

 
$
97,076

 
$
43,851

 
$
(79,947
)
Add: adjustments to net income for dilutive securities allocable to:
 
 
 
 
 
 
 
 
holders of preferred stock
 
2,229

 
1,940

 
2,281

 
—

holders of unvested early exercised options and restricted stock
 
48

 
41

 
28

 
—

Reallocation of undistributed earnings as a result of conversion of Class B to Class A
 
97,076

 
—

 
—

 
—

Reallocation of undistributed earnings to Class B shares
 
—

 
2,237

 
—

 
—

Undistributed net income (loss) attributable to common stockholders—diluted
 
$
113,853

 
$
101,294

 
$
46,160

 
$
(79,947
)
Distributed earnings to common stockholders
 
$
—

 
$
—

 
$
—

 
84,828

Denominator:
 
 
 
 
 
 
 
 
Weighted-average common shares—basic
 
13,575

 
90,878

 
81,018

 
74,226

Conversion of Class B to Class A common stock outstanding
 
90,878

 
—

 
—

 
—

Effect of potentially dilutive securities:
 
 
 
 
 
 
 
 
Stock options and RSUs
 
19,177

 
19,115

 
17,923

 
—

Weighted-average common shares—diluted
 
123,630

 
109,993

 
98,941

 
74,226

Net income per share attributable to common stockholders:
 
 
 
 
 
 
 
 
Distributed earnings—basic
 
$
—

 
$
—

 
$
—

 
$
1.15

Undistributed earnings—basic
 
$
1.07

 
$
1.07

 
$
0.54

 
$
(1.08
)
Basic net income per share
 
$
1.07

 
$
1.07

 
$
0.54

 
$
0.07

Distributed earnings—diluted
 
$
—

 
$
—

 
$
—

 
$
1.15

Undistributed earnings—diluted
 
$
0.92

 
$
0.92

 
$
0.47

 
$
(1.08
)
Diluted net income per share
 
 
$
0.92

 
$
0.92

 
$
0.47

 
$
0.07


The following potentially dilutive shares of common stock subject to options, unvested stock awards and redeemable convertible preferred stock were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive: