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Equity | 6 Months Ended
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Jun. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Equity | Equity Equity Award Plan In May 2025, the Company adopted the 2025 Stock Option and Incentive Plan (the “2025 Plan”), which replaced its previous stock option and incentive plan. The 2025 Plan provides for a maximum of 7.4 million shares to be issued. Stock-Based Compensation Expense Compensation expense related to stock-based awards was recorded as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Cost of revenue | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.4 |  |  | $ | 0.4 |
Research and development expenses | 2.9 |  |  | 2.1 |  |  | 5.5 |  |  | 4.2 |
Selling, general and administrative expenses | 4.4 |  |  | 14.6 |  |  | 19.8 |  |  | 26.6 |
Total | $ | 7.5 |  |  | $ | 17.0 |  |  | $ | 25.7 |  |  | $ | 31.2 |
Performance Share Units During the six months ended June 30, 2025, the Company granted 118,013 performance stock units (“PSUs”) with a weighted-average grant-date fair value per share of $299.45. The PSUs included a relative total shareholder return (total shareholder return for the Company compared with total shareholder return of a peer group) as a market component. Depending on the achievement of the performance criteria and the Company’s relative market performance during the three-year performance period, a recipient of the award could ultimately vest at up to 250% of the target award. Stock-based payments that contain both performance and market condition are recognized when performance conditions are probable of being achieved based on the grant date fair value. The Company uses the Monte Carlo model to estimate the probability of satisfying the market condition. The weighted-average assumptions used in the Monte Carlo model for PSUs granted were:
Risk-free interest rate | 4.0%
Expected stock price volatility | 41.7%
Peer group stock price volatility | 46.0%
Correlation of returns | 27.0%
Deferred Compensation Plan The Company has an unfunded, non-qualified deferred compensation plan for non-employee directors that allows participants to defer receipt of RSUs or cash compensation in the form of stock until a later date. Deferred awards are credited to a deferred stock account. The shares are held in a rabbi trust, which is classified and accounted for as equity in a manner consistent with the accounting for treasury stock. As of June 30, 2025, 3,495 shares were held in the trust. No shares were held in the trust as of December 31, 2024. The shares will be distributed when board service ceases. Share Repurchase Program In March 2025, the Company’s Board of Directors authorized a program to repurchase up to $125 million of common stock through December 31, 2026 to offset dilution from stock-based compensation. During the three and six months ended June 30, 2025, we repurchased approximately 93 thousand shares for $30.1 million under this program.

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- Definition The entire disclosure for shareholders' equity and share-based payment arrangement. Includes, but is not limited to, disclosure of policy and terms of share-based payment arrangement, deferred compensation arrangement, and employee stock purchase plan (ESPP). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/718/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/505/tableOfContent + Details
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