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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | 6. Stock-Based Compensation The following table summarizes our stock-based compensation expense (including stock options, restricted stock units ("RSUs") and performance stock units ("PSUs") for the three and six months ended June 30, 2024 and 2023:
|  | Three months ended June 30, |  |  | Six Months Ended June 30, |
(in millions) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Stock option compensation expense |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 2.1 |
RSU compensation expense |  |  | 1.4 |  |  |  | 1.3 |  |  |  | 5.0 |  |  |  | 3.6 |
PSU compensation expense |  |  | 1.0 |  |  |  | 1.8 |  |  |  | 2.3 |  |  |  | 3.2 |
Total stock-based compensation expense |  | $ | 2.5 |  |  | $ | 3.3 |  |  | $ | 7.6 |  |  | $ | 8.9 |
We generally recognize compensation expense for stock-based awards ratably over the vesting period. During the second quarter of 2024, the Company's Board of Directors approved the annual stock compensation grant to eligible non-employee directors, which consisted of 199,608 RSUs. The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of June 30, 2024:
|  | June 30, 2024
(in millions, except weighted average years) |  | Unrecognized Compensation Expense |  | Weighted Average Years Expense To Be Recognized Over
Stock options |  | $0.3 |  | 0.7
RSUs |  | $9.8 |  | 2.3
PSUs |  | $6.6 |  | 1.9

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