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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity Note [Abstract] |
Schedule of Convertible Preferred 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 |  |  |
Schedule of Stock Option and Restricted Stock Activity | 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 |
Schedule of Pre-Tax Intrinsic Value | 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 |  |  | $ | — |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21553-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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