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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | Additionally, the voluntary conversions of Class B common stock into Class A common stock are included in the table below weighted for the period outstanding in the year ended December 31, 2018:
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
| Class A |  | Class B |  | Class A |  | Class B |  | Class A |  | Class B
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common stockholders | $ | (138.7 | ) |  | $ | (346.2 | ) |  | $ | (3.6 | ) |  | $ | (108.1 | ) |  | $ | (6.1 | ) |  | $ | (204.1 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of common shares outstanding used in computing basic and diluted net loss per common share | 102.6 |  |  | 256.0 |  |  | 6.3 |  |  | 189.6 |  |  | 5.5 |  |  | 183.6 |
Net loss per common share, basic and diluted | $ | (1.35 | ) |  | $ | (1.35 | ) |  | $ | (0.57 | ) |  | $ | (0.57 | ) |  | $ | (1.11 | ) |  | $ | (1.11 | )
Schedule of Potentially Dilutive Securities Excluded from Computation of Earnings Per Share | The weighted-average impact of potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Convertible preferred stock | — |  |  | 147.6 |  |  | 147.6 |
Restricted stock units | 35.0 |  |  | 52.7 |  |  | 47.9 |
Options to purchase shares of common stock | 4.0 |  |  | 5.1 |  |  | 7.9 |
Co-Founder Grants(1) | 14.7 |  |  | 0.8 |  |  | — |
Shares subject to repurchase from early-exercised options and unvested restricted stock | 0.1 |  |  | 0.2 |  |  | 0.9 |
Total | 53.8 |  |  | 206.4 |  |  | 204.3 |
(1) | In December 2017, the Board of Directors approved a grant to the Company’s co-founders of non-Plan RSAs with respect to 14.7 million shares of Class A Common Stock. The table above reflects the weighted-average impact for the period they were outstanding for the year ended December 31, 2017. See Note 11 "Stockholders' Equity" for further details.

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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