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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Stock-Based Compensation Expense Related to Stock Options, RSUs and Restricted Stock | The following table summarizes the RSUs and restricted stock outstanding as of December 31, 2022 and September 30, 2023 and the changes that occurred during the nine months ended September 30, 2023:
|  | Number of Shares (in thousands) |  |  | Weighted Avg. Grant Date Fair Value (per share) |
Unvested RSUs and restricted stock outstanding, December 31, 2022 |  |  | 1,086 |  |  | $ | 17.54 |
RSUs and restricted stock granted |  |  | 1,484 |  |  | $ | 16.58 |
RSUs and restricted stock vested |  |  | (56 | ) |  | $ | 20.37 |
RSUs and restricted stock forfeited |  |  | (51 | ) |  | $ | 16.42 |
Unvested RSUs and restricted stock outstanding, September 30, 2023 |  |  | 2,463 |  |  | $ | 17.01 |
Summary of Stock Options Outstanding | The following table summarizes the ADTRAN Holdings, Inc. stock options outstanding as of December 31, 2022 and September 30, 2023 and the changes that occurred during the nine months ended September 30, 2023:
|  | 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, 2022 |  |  | 3,148 |  |  | $ | 14.37 |  |  |  | 3.42 |  |  | $ | 16,251 |
Stock options granted |  |  | 7 |  |  | $ | 12.17 |  |  |  |  |  |  |
Stock options exercised |  |  | (8 | ) |  | $ | 8.72 |  |  |  |  |  |  |
Stock options forfeited |  |  | (40 | ) |  | $ | 11.93 |  |  |  |  |  |  |
Stock options expired |  |  | (33 | ) |  | $ | 16.44 |  |  |  |  |  |  |
Stock options outstanding, September 30, 2023 |  |  | 3,074 |  |  | $ | 14.39 |  |  |  | 2.68 |  |  | $ | 736 |
Stock options exercisable, September 30, 2023 |  |  | 1,691 |  |  | $ | 15.88 |  |  |  | 1.23 |  |  | $ | 556 |
Adtran Networks SE [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Stock Options Outstanding | The following table summarizes the Adtran Networks stock options outstanding as of December 31, 2022 and September 30, 2023 and the changes that occurred during the nine months ended September 30, 2023:
|  | Number of Options (In thousands) |  |  | Weighted Average Exercise Price (Per share) |  |  | Weighted Avg. Remaining Contractual Life in Years |  |  | Aggregate Intrinsic Value (In thousands) |
Stock options outstanding, December 31, 2022 |  |  | 81 |  |  | $ | 8.58 |  |  |  | 4.00 |  |  | $ | 1,222 |
Stock options exercised |  |  | (13 | ) |  | $ | 8.22 |  |  |  |  |  |  |
Stock options forfeited |  |  | (9 | ) |  | $ | 10.58 |  |  |  |  |  |  |
Stock options expired |  |  | (1 | ) |  | $ | 9.20 |  |  |  |  |  |  |
Stock options outstanding, September 30, 2023 |  |  | 58 |  |  | $ | 8.18 |  |  |  | 3.39 |  |  | $ | 746 |
Stock options exercisable, September 30, 2023 |  |  | 12 |  |  | $ | 6.03 |  |  |  | 1.48 |  |  | $ | 182 |

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