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Stock-Based Compensation - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) shares | Sep. 30, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized stock-based compensation expense, outstanding stock options | $ | $ 52.9 | $ 52.9
Stock options vested and expected to vest (in shares) | shares | 19,400,000 | 19,400,000
2018 Equity Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for grant (in shares) | shares | 10,905,099 | 10,905,099
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options, stock incentive plans, maximum term |  | 10 years
Estimated remaining weighted average period |  | 3 years 2 months 12 days
Stock options | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options, stock incentive plan, vesting period |  | 3 years
Stock options | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options, stock incentive plan, vesting period |  | 4 years
Stock-based awards | 2018 Equity Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock reserved for issuance (in shares) | shares | 9,900,000 | 9,900,000
Restricted shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Estimated remaining weighted average period |  | 2 years 3 months 18 days
Unrecognized stock-based compensation expense, unvested restricted stock or RSUs | $ | $ 3.8 | $ 3.8
Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Estimated remaining weighted average period |  | 2 years 3 months 18 days
Unrecognized stock-based compensation expense, unvested restricted stock or RSUs | $ | $ 15.9 | $ 15.9
Restricted stock units | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options, stock incentive plan, vesting period |  | 2 years
Restricted stock units | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options, stock incentive plan, vesting period |  | 4 years
Employee stock purchase plan | 2018 ESPP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Estimated remaining weighted average period | 1 year 10 months 24 days |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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