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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock Unit Activity | During the fiscal year 2024, the following stock compensation was awarded to officers and employees. All awards were granted under the 2019 Amended and Restated Long-Term Incentive Plan ("2019 Plan"), with the exception of the inducement shares awarded as inducements material to new employees entering into employment with the Company in accordance with Nasdaq Listing Rule 5635(c)(4).
Type of Award | Quarter Awarded |  | Target Shares or Units |  | Weighted Average Grant Date Fair Value
Stock Options (1) | 1st Quarter |  | — |  |  | $ | — |
| 2nd Quarter |  | 145,984 |  |  | $ | 4.11 |
Restricted Stock Units (2) | 1st Quarter |  | 787,688 |  |  | $ | 9.05 |
| 2nd Quarter |  | 200,108 |  |  | $ | 7.56 |
Performance Stock Units (3)(4) | 1st Quarter |  | 911,400 |  |  | $ | 8.92 |
| 2nd Quarter |  | 424,400 |  |  | $ | 3.06 |
Inducement Shares (5) |  |  |  |  |
Stock Options | 1st Quarter |  | 18,700 |  |  | $ | 6.04 |
Restricted Stock Units | 1st Quarter |  | 310,000 |  |  | $ | 7.00 |
(1) Options granted to the Board of Directors during the second quarter for their annual fee vest in one year from the date of grant. (2) Restricted Stock Units (RSUs) awarded to certain officers and employees during the first and second quarter vest over a four-year period. Included in the second quarter RSUs are 85,224 units awarded to the Board of Directors for their annual fee which vest in one year from the date of the award. Upon vesting, the outstanding number of RSUs vested are converted into common stock. (3) Performance Stock Units (PSUs) awarded to certain officers and employees related to their work on the BLA ("2024 BLA PSUs") totaled 487,000 shares during the first quarter of 2024. Participants with 2024 BLA PSUs will earn from 0% to 100% upon achievement of certain milestones related to the BLA submission and FDA approval. The number of shares available for grant is linked to certain milestones related to the BLA submission to and approval by the FDA. These awards will vest provided the participants remain in continuous service to the Company through the achievement of the applicable performance goal and the one-year anniversary of the grant date. (4) PSUs were awarded to certain officers and employees with a target of 424,400 shares with performance metrics tied to the achievement of stock price goals between February 2024 through February 2027 ("TSR PSU") during the first quarter of 2024. Participants with TSR PSUs will earn from 0% to 200% upon achievement of specific stock price goals. The maximum number of shares that can be issued under this award is 848,800. Vesting occurs at the end of the three-year performance period upon Compensation Committee certification of the results at the end of the performance period. (5) Inducement shares were issued to officers during the first quarter of 2024, to new employees entering into employment with the Company in accordance with Nasdaq Listing Rule 5635(c)(4). Vesting for both the stock options and restricted stock units are over both a three-and four-year period. No Inducement shares were issued in the second quarter of 2024.
Schedule of Stock Based Compensation Expense | Total stock-based compensation expense is as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands) | 2024 |  | 2023 |  | 2024 |  | 2023
Stock-based compensation expense | $ | 3,907 |  |  | $ | 5,390 |  |  | $ | 7,826 |  |  | $ | 8,344 |

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