Stock-Based Compensation - ESPP (Details) - Employee Stock Purchase Plan - USD ($) |
12 Months Ended | ||
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Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Stock-Based Compensation | |||
| Discount on purchase of common stock (as a percent) | 5.00% | ||
| Maximum percentage of payroll deductions on eligible compensation | 10.00% | ||
| Maximum stock purchases by employees, value | $ 25,000 | ||
| Maximum stock purchases by employees (in shares) | 1,000 | ||
| Shares purchased by employees under the ESPP (in shares) | 1,000,000.0 | 1,000,000.0 | 1,000,000.0 |
| Shares available for purchase (in shares) | 18,800,000 | ||
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- Definition The maximum value of shares, which an employee can purchase in a calendar year. No definition available.
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- Definition Discount rate from fair value on purchase date that participants pay for shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The highest quantity of shares an employee can purchase under the plan per period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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