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v3.25.2

Restatement of Quarterly Financial Information - Schedule of Restatement of Condensed Consolidated Statements of Changes in Stockholders Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance | $ 138,893 | $ 126,951 | $ 260,849 | $ 605,257 | $ 126,951 | $ 605,257
Net loss | (18,258) | (8,948) | (47,162) | (328,235) |  |
Annual recurring compensation earned | (2,273) | (2,319) | (2,504) | (2,531) |  |
Other comprehensive loss, net of tax | 46,723 |  | (1,449) |  | 67,101 | (19,282)
Deferred compensation adjustments, net of tax |  | 38 | (3) | 262 |  |
ADTRAN RSUs and restricted stock vested | (54) | (1,170) | (16) | (242) |  |
ADTRAN stock-based compensation expense | 2,678 | 2,062 | 3,836 | 3,957 |  |
Redemption of redeemable non-controlling interest | 1,494 | (3) | 4 | 1 |  |
Ending Balance | 169,613 | 138,893 | 213,628 | 260,849 | 169,613 | 213,628
Adtran Networks SE [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
ADTRAN stock-based compensation expense |  | 1,148 | 6 | (6) |  |
Retained Deficit [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance | (700,502) | (688,813) | (562,492) | (231,706) | (688,813) | (231,706)
Net loss | (18,258) | (8,948) | (47,162) | (328,235) |  |
Annual recurring compensation earned | (2,273) | (2,319) | (2,504) | (2,531) |  |
Deferred compensation adjustments, net of tax |  |  | (3) | 3 |  |
ADTRAN RSUs and restricted stock vested | (54) | (1,174) | (16) | (243) |  |
ADTRAN stock options exercised |  |  |  | 219 |  |
Redemption of redeemable non-controlling interest | 1,494 | (3) | 4 | 1 |  |
Ending Balance | (719,183) | (700,502) | (612,167) | (562,492) | (719,183) | (612,167)
Retained Deficit [Member] | Adtran Networks SE [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
ADTRAN stock-based compensation expense |  |  | 6 |  |  |
Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance | 31,632 | 11,254 | 29,697 | 47,530 | 11,254 | 47,530
Other comprehensive loss, net of tax |  |  | (1,382) | (17,833) |  |
Ending Balance | 78,355 | 31,632 | 28,315 | 29,697 | 78,355 | 28,315
Additional Paid-in Capital [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance | 812,071 | 808,913 | 798,051 | 794,468 | 808,913 | 794,468
Deferred compensation adjustments, net of tax |  | (52) |  | (368) |  |
ADTRAN stock-based compensation expense | 2,678 | 2,062 | 3,836 | 3,957 |  |
Ending Balance | $ 814,749 | 812,071 | 801,887 | 798,051 | $ 814,749 | 801,887
Additional Paid-in Capital [Member] | Adtran Networks SE [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
ADTRAN stock-based compensation expense |  | $ 1,148 |  | (6) |  |
As Reported [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Other comprehensive loss, net of tax |  |  | (1,382) |  |  | (19,187)
Ending Balance |  |  | 220,229 |  |  | 220,229
As Reported [Member] | Retained Deficit [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance |  |  | (558,363) | (243,908) |  | (243,908)
Net loss |  |  | (47,011) | (321,670) |  |
Annual recurring compensation earned |  |  | (2,854) | (2,880) |  |
Deferred compensation adjustments, net of tax |  |  | (3) | 3 |  |
ADTRAN RSUs and restricted stock vested |  |  | (16) | (243) |  |
ADTRAN stock options exercised |  |  |  | 219 |  |
Redemption of redeemable non-controlling interest |  |  | 4 | 1 |  |
Foreign currency remeasurement of redeemable non-controlling interest |  |  | 1,868 | 10,115 |  |
Ending Balance |  |  | (606,375) | (558,363) |  | (606,375)
As Reported [Member] | Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance |  |  | 29,656 | 47,461 |  | 47,461
Other comprehensive loss, net of tax |  |  | (1,382) | (17,805) |  |
Ending Balance |  |  | 28,274 | 29,656 |  | 28,274
As Reported [Member] | Additional Paid-in Capital [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance |  |  | 798,897 | 795,304 |  | 795,304
Deferred compensation adjustments, net of tax |  |  |  | (368) |  |
ADTRAN stock-based compensation expense |  |  | 3,836 | 3,957 |  |
Ending Balance |  |  | 802,737 | 798,897 |  | 802,737
As Reported [Member] | Additional Paid-in Capital [Member] | Adtran Networks SE [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
ADTRAN stock-based compensation expense |  |  | 4 | 4 |  |
Adjustment [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Other comprehensive loss, net of tax |  |  | (67) |  |  | (95)
Ending Balance |  |  | (6,601) |  |  | (6,601)
Adjustment [Member] | Retained Deficit [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance |  |  | (4,129) | 12,202 |  | 12,202
Net loss |  |  | (151) | (6,565) |  |
Annual recurring compensation earned |  |  | 350 | 349 |  |
Foreign currency remeasurement of redeemable non-controlling interest |  |  | (1,868) | (10,115) |  |
Ending Balance |  |  | (5,792) | (4,129) |  | (5,792)
Adjustment [Member] | Retained Deficit [Member] | Adtran Networks SE [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
ADTRAN stock-based compensation expense |  |  | 6 |  |  |
Adjustment [Member] | Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance |  |  | 41 | 69 |  | 69
Other comprehensive loss, net of tax |  |  |  | (28) |  |
Ending Balance |  |  | 41 | 41 |  | 41
Adjustment [Member] | Additional Paid-in Capital [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Beginning Balance |  |  | (846) | (836) |  | (836)
Ending Balance |  |  | (850) | (846) |  | $ (850)
Adjustment [Member] | Additional Paid-in Capital [Member] | Adtran Networks SE [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
ADTRAN stock-based compensation expense |  |  | $ (4) | $ (10) |  |

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