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Equity Incentive Plans and Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of shares available for grant | A summary of shares available for grant under the Company’s plans is as follows:
|  | Shares Available for Grant
Total shares available for grant as of December 31, 2023 |  | 11,954,150
Stock options expired |  | 1,125
Nonvested equity stock and stock units granted (1) (2) |  | (1,145,510)
Nonvested equity stock and stock units forfeited (1) |  | 290,495
Total shares available for grant as of September 30, 2024 |  | 11,100,260
_________________________________________ (1) For purposes of determining the number of shares available for grant under the 2015 Plan against the maximum number of shares authorized, each restricted stock unit granted prior to April 27, 2023 reduces the number of shares available for grant by 1.5 shares and each restricted stock unit forfeited increases shares available for grant by 1.5 shares. Each restricted stock unit granted on or after April 27, 2023 reduces the number of shares available for grant by 1.0 share and each restricted stock unit forfeited increases shares available for grant by 1.0 share. (2) Amount includes approximately 0.1 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in the second quarter of 2024 and discussed under the section titled “Nonvested Equity Stock and Stock Units” below.
Schedule of stock option activity | The following table summarizes stock option activity under the Company’s equity incentive plans for the nine months ended September 30, 2024 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of September 30, 2024.
|  | Options Outstanding |  |  |  |
(In thousands, except shares, per share amounts and years) |  | Number of Shares |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2023 |  | 124,732 |  | $ | 11.60 |  |  |  |  |
Options exercised |  | (33,607) |  | $ | 9.42 |  |  |  |  | $ | 1,102 |
Options expired |  | (1,125) |  | $ | 8.76 |  |  |  |  |
Outstanding and vested as of September 30, 2024 |  | 90,000 |  | $ | 12.45 |  |  | 3.79 |  | $ | 2,679 |
Schedule of nonvested equity stock and stock units activity | The following table reflects the activity related to nonvested equity stock and stock units for the nine months ended September 30, 2024:
Nonvested Equity Stock and Stock Units |  | Shares |  | Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2023 |  | 3,430,192 |  | $ | 32.90 |
Granted |  | 1,000,828 |  | $ | 59.76 |
Vested |  | (1,226,610) |  | $ | 26.59 |
Forfeited |  | (207,877) |  | $ | 36.91 |
Nonvested at September 30, 2024 |  | 2,996,533 |  | $ | 44.17 |

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