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Loss per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Summary of Calculation of Basic and Diluted Loss Per Share | Basic net loss per share is computed by dividing net income by basic weighted-average shares outstanding during the period. Diluted net income per share is computed by dividing net income by diluted weighted-average shares outstanding during the period giving effect to all potentially dilutive securities to the extent they are dilutive. We compute the dilutive effect of shares issuable upon conversion of our 2030 notes using the if-converted method and equity awards under our employee equity incentive plans using the treasury stock method.
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
(In thousands, except per share amounts) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  |  |  |  | (Restated) |  |  |  |  |  | (Restated) |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to ADTRAN Holdings, Inc. |  | $ | (10,262 | ) |  | $ | (33,348 | ) |  | $ | (42,060 | ) |  | $ | (413,780 | )
Effect of redemption of RNCI |  |  | 519 |  |  |  | 2,976 |  |  |  | 2,010 |  |  |  | 2,976 |
Net loss attributable to ADTRAN Holdings, Inc. common stockholders |  | $ | (9,743 | ) |  | $ | (30,372 | ) |  | $ | (40,050 | ) |  | $ | (410,804 | )
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares – basic |  |  | 79,803 |  |  |  | 78,952 |  |  |  | 79,696 |  |  |  | 78,873 |
Weighted average number of shares – diluted |  |  | 79,803 |  |  |  | 78,952 |  |  |  | 79,696 |  |  |  | 78,873 |
Loss per share attributable to ADTRAN Holdings, Inc. – basic |  | $ | (0.12 | ) |  | $ | (0.38 | ) |  | $ | (0.50 | ) |  | $ | (5.21 | )
Loss per share attributable to ADTRAN Holdings, Inc. – diluted |  | $ | (0.12 | ) |  | $ | (0.38 | ) |  | $ | (0.50 | ) |  | $ | (5.21 | )
Schedule of Antidilutive Securities Excluded from Earnings Per Share Computation | The following potentially dilutive shares were excluded from the calculation of the diluted weighted average number of shares outstanding as the effect would have been anti-dilutive:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
(In thousands) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Convertible senior notes |  |  | 2,089 |  |  |  | — |  |  |  | 704 |  |  |  | — |
Stock options |  |  | 814 |  |  |  | 4,006 |  |  |  | 921 |  |  |  | 4,163 |
PSUs, RSUs and restricted stock |  |  | 967 |  |  |  | 921 |  |  |  | 913 |  |  |  | 1,136 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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