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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock | The following table summarizes the PSUs, RSUs and restricted stock outstanding as of December 31, 2023 and March 31, 2024 and the changes that occurred during the three months ended March 31, 2024:
|  | Number of Shares (in thousands) |  |  | Weighted Avg. Grant Date Fair Value (per share) |
Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2023 |  |  | 1,942 |  |  | $ | 17.46 |
PSUs, RSUs and restricted stock granted |  |  | 966 |  |  | $ | 7.22 |
PSUs, RSUs and restricted stock vested |  |  | (102 | ) |  | $ | 18.47 |
PSUs, RSUs and restricted stock forfeited |  |  | (32 | ) |  | $ | 17.36 |
Unvested PSUs RSUs and restricted stock outstanding, March 31, 2024 |  |  | 2,774 |  |  | $ | 13.79 |
Summary of Stock Options Outstanding | The following table summarizes the ADTRAN Holdings, Inc. stock options outstanding as of December 31, 2023 and March 31, 2024 and the changes that occurred during the three months ended March 31, 2024:
|  | Number of Stock Options (in thousands) |  |  | Weighted Avg. Exercise Price (per share) |  |  | Weighted Avg. Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Stock options outstanding, December 31, 2023 |  |  | 3,894 |  |  | $ | 10.32 |  |  |  | 5.25 |  |  | $ | 3,087 |
Stock options exercised |  |  | (36 | ) |  | $ | 6.06 |  |  |  |  |  |  |
Stock options forfeited |  |  | (58 | ) |  | $ | 6.68 |  |  |  |  |  |  |
Stock options expired |  |  | (178 | ) |  | $ | 7.89 |  |  |  |  |  |  |
Stock options outstanding, March 31, 2024 |  |  | 3,622 |  |  | $ | 10.54 |  |  |  | 5.18 |  |  | $ | 268 |
Stock options exercisable, March 31, 2024 |  |  | 1,264 |  |  | $ | 13.30 |  |  |  | 1.43 |  |  | $ | — |

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