Stock-Based Compensation |
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| Share-Based Payment Arrangement [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stock-Based Compensation | 4. STOCK-BASED COMPENSATION 2024 Stock Incentive Plans At the annual meeting of stockholders held on May 8, 2024, the Company’s stockholders approved, upon recommendation of the Board of Directors, the adoption of the ADTRAN Holdings, Inc. 2024 Employee Stock Incentive Plan (“2024 Employee Plan”) and the ADTRAN Holdings, Inc. 2024 Directors Stock Plan (“2024 Directors Plan”). Outstanding awards granted under the Company's prior equity incentive plans will remain subject to the terms of such applicable plans, and shares under such plans that are cancelled or forfeited will be available for issuance under the 2024 Employee Plan or the 2024 Directors Plan, as applicable. As of June 30, 2026, 4.4 million shares were available for issuance pursuant to awards that may be made in the future under shareholder-approved equity plans. For the three months ended June 30, 2026 and 2025, stock-based compensation expense was $2.9 million and $2.7 million, respectively, and for the six months ended June 30, 2026 and 2025, stock-based compensation expense was $4.7 million and $5.9 million, respectively. PSUs, RSUs and Restricted Stock The following table summarizes the changes of the PSUs, RSUs and restricted stock outstanding as of December 31, 2025 and June 30, 2026 and the changes that occurred during the six months ended June 30, 2026:
The fair value of PSUs with performance conditions, RSUs and restricted stock is equal to the closing price of the Company's stock on the date of grant. The fair value of PSUs with market conditions is calculated using a Monte Carlo simulation valuation method. As of June 30, 2026, total unrecognized compensation expense related to the non-vested portion of market-based PSUs, RSUs and restricted stock was approximately $24.9 million, which will be recognized over the remaining weighted-average period of 2.8 years. Unrecognized compensation expense will be adjusted for actual forfeitures.
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