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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation We currently grant restricted stock unit awards to employees, directors and non-employee consultants under our 2010 Equity Incentive Plan and from time to time may also grant stock option awards. Through our 2010 Employee Stock Purchase Plan, employees are also able to purchase shares of our Class A common stock at a discount through payroll deductions. We have reserved shares of our Class A common stock for issuance under these plans. The total stock-based compensation expense recognized was $8.6 million and $9.2 million for the three months ended March 31, 2024 and 2023, respectively. Restricted Stock Units Restricted stock unit activity for awards subject to only service conditions was as follows for the three months ended March 31, 2024:
|  | Shares |  | Weighted-Average Grant-Date Fair Value
|  | (In thousands, except per share data)
Outstanding at December 31, 2023 |  | 2,049 |  |  | $ | 21.66 |
Restricted stock units granted |  | 1,931 |  |  | 8.97 |
Restricted stock units vested |  | (504) |  |  | 23.71 |
Restricted stock units canceled |  | (97) |  |  | 25.93 |
Outstanding at March 31, 2024 |  | 3,379 |  |  | $ | 13.98 |
Performance-Based Restricted Stock Units Performance-based restricted stock unit activity for the three months ended March 31, 2024 was as follows:
|  | Shares |  | Weighted-Average Grant-Date Fair Value
|  | (In thousands, except per share data)
Outstanding at December 31, 2023 |  | 988 |  |  | $ | 22.88 |
Performance restricted stock units granted |  | 981 |  |  | 8.98 |
Performance restricted stock units canceled |  | (62) |  |  | 28.52 |
Outstanding at March 31, 2024 |  | 1,907 |  |  | $ | 15.55 |
We grant performance-based restricted stock units to certain employees that are subject to the attainment of pre-established internal performance conditions, market conditions, or a combination thereof (collectively referred to herein as "performance-based restricted stock units"). The actual number of shares subject to the award is determined at the end of the performance period and may range from 0% to 200% of the target shares granted depending upon the terms of the award. Compensation expense related to these awards is recognized using the accelerated attribution method over the vesting period based on the grant date fair value of the award. Stock Options Total stock option activity for the three months ended March 31, 2024 was as follows:
|  | Options |  | Weighted-Average Exercise Price
|  | (In thousands, except per share data)
Outstanding at December 31, 2023 |  | 1,010 |  |  | $ | 23.78 |
Options canceled |  | (1) |  |  | 24.25 |
Outstanding at March 31, 2024 |  | 1,009 |  |  | $ | 23.78 |
Exercisable at March 31, 2024 |  | 1,009 |  |  | $ | 23.78 |

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