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Equity Incentive Plans and Stock-Based Compensation (Details) - shares | 6 Months Ended
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Jun. 30, 2021
Stock compensation plan |  |
Shares available for grant |  |
Shares available, at the beginning of the year |  | 12,412,320
Stock options forfeited (in shares) |  | 51,477
Nonvested equity stock and stock units granted (in shares) | [1],[2] | (3,369,905)
Nonvested equity stock and stock units forfeited (in shares) | [2] | 1,155,509
Shares available, at the end of the period |  | 10,249,401
Conversion factor used to calculate the decrease in the number of shares available for grant resulting from the grant of restricted stock awards |  | 1.5
Conversion factor used to calculate the increase in the number of shares available for grant resulting from the forfeiture of restricted stock awards |  | 1.5
Potential additional performance stock units |  |
Shares available for grant |  |
Nonvested equity stock and stock units granted (in shares) | [1] | 400,000
[1] | Amount includes approximately 0.4 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in the first quarter of 2021 and discussed under the section titled “Nonvested Equity Stock and Stock Units” below
[2] | For purposes of determining the number of shares available for grant under the 2015 Equity Incentive Plan (the “2015 Plan”) against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 shares.

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- Definition Represents the increase in number of shares available for grant under the stock incentive plans, which is based on a factor of 1.5 for every restricted stock award forfeited for the period. + References No definition available. + Details
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- Definition For purposes of determining the number of shares available for grant under the Equity Incentive Plan, represents the multiplier by which the number of shares available for grant will increase, for every restricted stock award forfeited. + References No definition available. + Details
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- Definition Represents the decrease in number of shares available for grant under the stock incentive plans, which is based on a factor of 1.5 for every restricted stock award granted for the period. + References No definition available. + Details
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- Definition For purposes of determining the number of shares available for grant under the Equity Incentive Plan, represents the multiplier by which the number of shares available for grant will decrease, for every restricted stock award granted. + References No definition available. + Details
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Details
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