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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | Stockholders’ Equity Common stock The Company’s amended and restated certificate of incorporation authorizes the issuance of Class A common stock, Class B common stock, and Class C common stock. Holders of Class A common stock, Class B common stock, and Class C common stock are entitled to dividends on a pro rata basis, when, as, and if declared by the Company’s Board of Directors, subject to the rights of the holders of the Company’s preferred stock. Holders of Class A common stock are entitled to one vote per share, holders of Class B common stock are entitled to 10 votes per share, and holders of Class C common stock are entitled to zero votes per share. During the year ended December 31, 2018, holders of 157.0 million shares of Class B common stock voluntarily converted their shares into an equivalent number of shares of Class A common stock. As of December 31, 2018, the Company had authorized 2,400.0 million shares of Class A common stock, 475.0 million shares of Class B common stock, and 800.0 million shares of Class C common stock, each at par value of $0.00001. As of December 31, 2018, 211.0 million shares of Class A common stock, 198.6 million shares of Class B common stock, and no shares of Class C common stock were issued and outstanding. As of December 31, 2017, 8.9 million shares of Class A common stock, 187.9 million shares of Class B common stock, and no shares of Class C common stock were issued and outstanding. Class A shares issued and outstanding as of December 31, 2018 and December 31, 2017 exclude 14.7 million unvested restricted stock awards granted to the Company’s co-founders. See "Co-Founder Grants" section below for further details. Convertible preferred stock Immediately prior to the closing of the Company’s IPO, all of the 147.3 million shares of convertible preferred stock converted into an equivalent number of shares of Class B common stock. Further, pursuant to transfer agreements with certain of the Company’s stockholders, 0.3 million shares of the Company’s convertible preferred stock automatically converted into an equivalent number of shares of Class A common stock. The authorized, issued and outstanding shares of convertible preferred stock and liquidation preferences as of December 31, 2017 were as follows:
| Shares |  | Per share price at issuance |  | Aggregate liquidation preference |  | Dividend per share amount
| Authorized |  | Outstanding |
Series A | 63.9 |  | 63.9 |  | $ | 0.09 |  |  | $ | 6.0 |  |  | $ | 0.02 |
Series A-1 | 52.0 |  | 51.9 |  | 0.03 |  |  | 1.3 |  |  | 0.02 |
Series B | 19.5 |  | 19.5 |  | 13.58 |  |  | 264.8 |  |  | 1.08 |
Series C | 15.8 |  | 12.3 |  | $ | 28.65 |  |  | 352.6 |  |  | $ | 2.30 |
| 151.2 |  | 147.6 |  |  |  | $ | 624.7 |  |  |
Preferred stock The Company's Board of Directors will have the authority, without further action by the Company's stockholders, to issue up to 240.0 million shares of undesignated preferred stock with rights and preferences, including voting rights, designated from time to time by the Board of Directors. Equity incentive plans Under the 2018 Plan, the Company may grant stock-based awards to purchase or directly issue shares of common stock to employees, directors, and consultants. Options are granted at a price per share equal to the fair market value of the Company's common stock at the date of grant. Options granted are exercisable over a maximum term of 10 years from the date of grant and generally vest over a period of four years. No options have been granted since August of 2015. RSUs and RSAs are also granted under the 2018 Plan. The 2018 Plan will terminate 10 years after the later of (i) its adoption or (ii) the most recent stockholder-approved increase in the number of shares reserved under the 2018 Plan, unless terminated earlier by the Company's Board of Directors. The 2018 Plan was adopted on March 22, 2018 with a reserve of 41.4 million shares of Class A common stock for future issuance. As of December 31, 2018, there were 26.3 million stock-based awards issued and outstanding and 57.1 million shares available for issuance under the 2008 Equity Incentive Plan, the 2017 Equity Incentive Plan, and the 2018 Plan (collectively, the "Plans"). Stock option and restricted stock activity for the Plans was as follows for the years ended December 31, 2018, 2017, and 2016:
|  |  | Options outstanding |  | Restricted stock outstanding
| Number of shares available for issuance under the Plans |  | Number of shares outstanding under the Plans |  | Weighted- average exercise price per share |  | Weighted- average remaining contractual term (In years) |  | Number of Plan shares outstanding |  | Weighted- average grant date fair value per share
Balance at December 31, 2015 | 14.6 |  |  | 13.4 |  |  | $ | 17.51 |  |  | 8.1 |  | 43.5 |  |  | $ | 17.67 |
Options and RSUs canceled | 14.1 |  |  | (8.0 | ) |  | 22.04 |  |  |  |  | (6.1 | ) |  | 20.06 |
Restricted stock granted | (16.6 | ) |  | — |  |  | — |  |  |  |  | 16.6 |  |  | 15.59 |
Balance at December 31, 2016 | 12.1 |  |  | 5.4 |  |  | $ | 10.68 |  |  | 6.5 |  | 54.0 |  |  | $ | 16.41 |
Additional shares authorized | 6.7 |  |  | — |  |  | — |  |  |  |  | — |  |  | — |
Options exercised and RSUs released | — |  |  | (0.1 | ) |  | 6.00 |  |  |  |  | (14.6 | ) |  | 17.12 |
Options and RSUs canceled | 6.2 |  |  | (0.3 | ) |  | 17.44 |  |  |  |  | (6.0 | ) |  | 17.96 |
Shares repurchased for tax withholdings on release of restricted stock | 5.5 |  |  | — |  |  | — |  |  |  |  | — |  |  | 17.09 |
Restricted stock granted | (21.5 | ) |  | — |  |  | — |  |  |  |  | 21.5 |  |  | 15.70 |
Balance at December 31, 2017 | 9.0 |  |  | 5.0 |  |  | $ | 10.52 |  |  | 5.5 |  | 54.9 |  |  | $ | 15.60 |
Reserved for issuance under the 2018 Plan | 41.4 |  |  | — |  |  | $ | — |  |  |  |  | — |  |  | $ | — |
Additional shares authorized | 1.3 |  |  | — |  |  | $ | — |  |  |  |  | — |  |  | $ | — |
Options exercised and RSUs released | — |  |  | (3.4 | ) |  | $ | 7.75 |  |  |  |  | (40.4 | ) |  | $ | 15.42 |
Options and RSUs canceled | 6.0 |  |  | (0.3 | ) |  | $ | 22.90 |  |  |  |  | (5.7 | ) |  | $ | 16.78 |
Shares repurchased for tax withholdings on release of restricted stock | 15.6 |  |  | — |  |  | $ | — |  |  |  |  | — |  |  | $ | 15.45 |
Restricted stock granted | (16.2 | ) |  | — |  |  | $ | — |  |  |  |  | 16.2 |  |  | $ | 20.26 |
Balance at December 31, 2018 | 57.1 |  |  | 1.3 |  |  | $ | 14.68 |  |  | 5.0 |  | 25.0 |  |  | $ | 18.68 |
Vested at December 31, 2018 |  |  | 1.3 |  |  | $ | 14.68 |  |  |  |  | — |  |  | $ | — |
Unvested at December 31, 2018 |  |  | — |  |  | $ | — |  |  |  |  | 25.0 |  |  | $ | 18.68 |
The following table summarizes information about the pre-tax intrinsic value of options exercised and the weighted-average grant date fair value per share of options granted during the years ended December 31, 2018, 2017, and 2016:
|  | Year ended December 31,
|  | 2018 |  | 2017 |  | 2016
Intrinsic value of options exercised |  | $ | 59.0 |  |  | $ | 1.2 |  |  | $ | — |
As of December 31, 2018, unamortized stock-based compensation expense related to unvested stock options, RSAs (excluding the Co-Founder Grants, which are non-Plan RSAs), and one-tier RSUs was $429.0 million. The weighted-average period over which such compensation expense will be recognized if the requisite service is provided is approximately 2.8 years as of December 31, 2018. The total fair value of RSUs, as of their respective vesting dates, during the years ended December 31, 2018, 2017 and 2016 were $913.5 million, $232.5 million, and $77.2 million, respectively. Co-Founder Grants 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 in the aggregate (collectively, the “Co-Founder Grants”), of which 10.3 million RSAs were granted to Mr. Houston, the Company’s co-founder and Chief Executive Officer, and 4.4 million RSAs were granted to Mr. Ferdowsi, the Company’s co-founder and Director. These Co-Founder Grants have service-based, market-based, and performance-based vesting conditions. The Co-Founder Grants are excluded from Class A common stock issued and outstanding until the satisfaction of these vesting conditions. The Co-Founder Grants also provide the holders with certain stockholder rights, such as the right to vote the shares with the other holders of Class A common stock and a right to cumulative declared dividends. However, the Co-Founder Grants are not considered a participating security for purposes of calculating net loss per share attributable to common stockholders in Note 12, "Net Loss Per Share", as the right to the cumulative declared dividends is forfeitable if the service condition is not met. The Co-Founder Grants are eligible to vest over the ten-year period following the date the Company’s shares of Class A common stock commenced trading on the Nasdaq Global Select Market in connection with the Company’s IPO. The Co-Founder Grants comprise nine tranches that are eligible to vest based on the achievement of stock price goals, each of which are referred to as a Stock Price Target, measured over a consecutive thirty-day trading period during the Performance Period. The Performance Period will begin on January 1, 2019. During the first four years of the Performance Period, no more than 20% of the shares subject to each Co-Founder Grant would be eligible to vest in any calendar year. After the first four years, all shares are eligible to vest based on the achievement of the Stock Price Targets. The Company calculated the grant date fair value of the Co-Founder Grants based on multiple stock price paths developed through the use of a Monte Carlo simulation. A Monte Carlo simulation also calculates a derived service period for each of the nine vesting tranches, which is the measure of the expected time to achieve each Stock Price Target. A Monte Carlo simulation requires the use of various assumptions, including the underlying stock price, volatility, and the risk-free interest rate as of the valuation date, corresponding to the length of time remaining in the performance period, and expected dividend yield. The weighted-average grant date fair value of each Co-Founder Grant was estimated to be $10.60 per share. The weighted-average derived service period of each Co-Founder Grant was estimated to be 5.2 years, and ranged from 2.9 - 6.9 years. The Company will recognize aggregate stock-based compensation expense of $156.2 million over the derived service period of each tranche using the accelerated attribution method as long as the co-founders satisfy their service-based vesting conditions. If the Stock Price Targets are met sooner than the derived service period, the Company will adjust its stock-based compensation to reflect the cumulative expense associated with the vested awards. The Company will recognize expense if the requisite service is provided, regardless of whether the market conditions are achieved. The Performance Vesting Condition for the Co-Founder Grants was satisfied on the date the Company’s shares of Class A common stock commenced trading on the Nasdaq Global Select Market in connection with the Company’s IPO, which was March 23, 2018. The Company recognized $37.0 million in stock-based compensation related to the Co-Founder Grants during the year ended December 31, 2018. As of December 31, 2018, unamortized stock-based compensation expense related to the Co-Founder Grants was $119.3 million. The weighted-average period over which such compensation expense will be recognized if the requisite service is provided is approximately 4.0 years as of December 31, 2018. Award modifications During the year ended December 31, 2017, the Company's Board of Directors voted to approve a modification of vesting schedules for certain unvested one-tier and two-tier RSUs to align the vesting schedules for all RSUs to vest once per quarter. The modification was effective February 15, 2018, which resulted in accelerated vesting of impacted RSUs that had met their service requirement as of that date. As a result, the Company recognized an incremental $10.0 million in stock-based compensation during the first quarter of 2018, which is included in the results for the year ended December 31, 2018, related to these modified one-tier and two-tier RSUs. During the year ended December 31, 2016, the Company’s Board of Directors voted to approve the exchange of stock options previously granted to an executive officer under the Plan for one-tier RSUs. In total, options to purchase 4.3 million shares of common stock were exchanged for 2.2 million RSUs. Total compensation expense for the modified awards is $37.7 million, of which $18.8 million in stock-based compensation expense was recognized on the date of exchange representing the portion that vested immediately. Out of the total $37.7 million in stock-based compensation expense, $8.9 million was incremental to what would have been recognized related to the original stock option award. As of December 31, 2018, there was no remaining unamortized expense relating to these awards.

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- Definition The entire disclosure for accounts comprising shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income, and compensation-related costs for equity-based compensation. Includes, but is not limited to, disclosure of policies, compensation plan details, equity-based arrangements to obtain goods and services, deferred compensation arrangements, and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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