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Redeemable Non-controlling Interest | 9 Months Ended
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Sep. 30, 2025
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] |
Redeemable Non-controlling Interest | 15. REDEEMABLE NON-CONTROLLING INTEREST As of September 30, 2025, the non-controlling Adtran Networks stockholders’ equity ownership percentage in Adtran Networks was approximately 31.4%. The following table summarizes the RNCI activity for the nine months ended September 30, 2025 and for the year ended December 31, 2024:
|  | Nine Months Ended |  |  | For the Year Ended |  |
(In thousands) |  | September 30, 2025 |  |  | December 31, 2024 |  |
Balance at beginning of period |  | $ | 422,943 |  |  | $ | 443,327 |  |
Redemption of redeemable non-controlling interest |  |  | (20,855 | ) |  |  | (20,384 | ) |
Net income attributable to redeemable non-controlling interests |  |  | 7,096 |  |  |  | 9,824 |  |
Annual recurring compensation earned |  |  | (7,096 | ) |  |  | (9,824 | ) |
Balance at end of period |  | $ | 402,088 |  |  | $ | 422,943 |  |
Annual Recurring Compensation payable on untendered outstanding shares under the DPLTA must be recognized as it is accrued. For the three and nine months ended September 30, 2025, we have accrued $2.5 million and $7.5 million, respectively, and for the year ended December 31, 2024, the Company accrued $9.8 million, representing the portion of the annual recurring cash compensation to the non-controlling shareholders during such periods. On July 1, 2025, the Company paid the Annual Recurring Compensation with respect to the 2024 fiscal year, which is paid annually after the ordinary general shareholders' meeting of Adtran Networks which was held on June 27, 2025. The 2025 Annual Recurring Compensation accrual will be paid after the ordinary general shareholders' meeting of Adtran Networks in 2026.

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