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Net income per share attributable to common stockholders (Tables) | 12 Months Ended
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Dec. 31, 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:
| Year ended December 31,
(in thousands, except per share data) | 2015 |  | 2014 |  | 2013
| Class A |  | Class B |  | Class A |  | Class B |  |
Numerator: |  |  |  |  |  |  |  |  |
Allocation of net income | $ | 24,559 |  |  | $ | 11,572 |  |  | $ | 16,647 |  |  | $ | 111,441 |  |  | $ | 60,578 |
Less: net income allocable to participating securities | — |  |  | — |  |  | (2,147 | ) |  | (14,365 | ) |  | (16,727 | )
Net income attributable to common stockholders—basic | 24,559 |  |  | 11,572 |  |  | 14,500 |  |  | 97,076 |  |  | 43,851 |
Add: net income allocable to dilutive participating securities | — |  |  | — |  |  | 2,277 |  |  | 1,981 |  |  | 2,309 |
Reallocation of net income as a result of conversion of Class B to Class A shares | 11,572 |  |  |  |  | 97,076 |  |  | — |  |  | — |
Reallocation of net income to Class B shares | — |  |  | 1,974 |  |  | — |  |  | 2,237 |  |  | — |
Net income attributable to common stockholders—diluted | $ | 36,131 |  |  | $ | 13,546 |  |  | $ | 113,853 |  |  | $ | 101,294 |  |  | $ | 46,160 |
Denominator: |  |  |  |  |  |  |  |  |
Weighted-average common shares—basic | 91,486 |  |  | 43,109 |  |  | 13,575 |  |  | 90,878 |  |  | 81,018 |
Conversion of Class B to Class A common stock outstanding | 43,109 |  |  | — |  |  | 90,878 |  |  | — |  |  | — |
Effect of potentially dilutive shares | 11,891 |  |  | 11,810 |  |  | 19,177 |  |  | 19,115 |  |  | 17,923 |
Weighted-average common shares—diluted | 146,486 |  |  | 54,919 |  |  | 123,630 |  |  | 109,993 |  |  | 98,941 |
Net income per share attributable to common stockholders: |  |  |  |  |  |  |  |  |
Basic | $ | 0.27 |  |  | $ | 0.27 |  |  | $ | 1.07 |  |  | $ | 1.07 |  |  | $ | 0.54 |
Diluted | $ | 0.25 |  |  | $ | 0.25 |  |  | $ | 0.92 |  |  | $ | 0.92 |  |  | 0.47 |
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:
| Year ended December 31,
(in thousands) | 2015 |  | 2014 |  | 2013
Redeemable convertible preferred stock | — |  |  | 15,136 |  |  | 30,523
Stock options, ESPP shares, and RSUs | 2,680 |  |  | 360 |  |  | 1,409
Unvested restricted stock awards | 1 |  |  | 425 |  |  | 380
| 2,681 |  |  | 15,921 |  |  | 32,312 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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