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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 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 |  | — |  |  | $ | — |
Restricted Stock Units (2) | 1st Quarter |  | 787,688 |  |  | $ | 9.05 |
Performance Stock Units (3)(4) | 1st Quarter |  | 911,400 |  |  | $ | 8.92 |
Inducement Shares (5) |  |  |  |  |
Stock Options | 1st Quarter |  | 18,700 |  |  | $ | 6.04 |
Restricted Stock Units | 1st Quarter |  | 310,000 |  |  | $ | 7.00 |
(1) Options awarded to officers and employees during the first quarter vest over a four-year period. (2) Restricted Stock Units (RSUs) awarded to certain officers and employees during the first quarter vest over a four-year period. 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 487,400 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 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. Absent the shareholder approval of an increase to the number of authorized shares under the Amended and Restated 2019 Plan at the 2024 Shareholder Meeting, the settlement of the TSR PSUs awards are limited to 100%. 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.
Schedule of Stock Based Compensation Expense | Total stock-based compensation expense is as follows:
| Three Months Ended March 31, |  |
(in thousands) | 2024 |  | 2023 |  |  |  |
Stock-based compensation expense | $ | 3,919 |  |  | $ | 2,954 |  |  |  |  |

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