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Equity Incentive Plans and Employee Stock Purchase Plan - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - shares shares in Millions | 1 Months Ended | 9 Months Ended
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Oct. 31, 2017 | Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Maximum employee contribution rate | 15.00% |
Duration of separate offering periods | 6 months |
Purchase price of common stock, as a percent |  | 85.00%
Class A Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Reserved for future issuance (in shares) | 1.5 |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Duration Of Offering Periods + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: 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 The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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