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Summary of Significant Accounting Policies (Policies) | 3 Months Ended
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Mar. 31, 2023
Accounting Policies [Abstract] |
Basis of Presentation | Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements of ADTRAN Holdings, Inc. and its subsidiaries have been prepared pursuant to the rules and regulations of the SEC applicable to interim financial information presented in Quarterly Reports on Form 10-Q. Accordingly, certain information and notes required by generally accepted accounting principles in the United States of America (“U.S. GAAP”) for complete financial statements are not included herein. The December 31, 2022 Condensed Consolidated Balance Sheet is derived from audited financial statements but does not include all disclosures required by U.S. GAAP. In the opinion of management, all adjustments necessary to fairly state these interim statements have been recorded and are of a normal and recurring nature. The results of operations for an interim period are not necessarily indicative of the results for the full year. The interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in ADTRAN Holdings, Inc. Annual Report on Form 10-K/A for the year ended December 31, 2022, filed with the SEC on August 14, 2023.
Use of Estimates | Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Significant estimates include allowance for credit losses on accounts receivable and contract assets, excess and obsolete inventory reserves, warranty reserves, customer rebates, determination and accrual of the deferred revenue related to performance obligations under contracts with customers, estimated costs to complete obligations associated with deferred and accrued revenues and network installations, estimated income tax provision and income tax contingencies, fair value of stock-based compensation, assessment of goodwill and other intangibles for impairment, estimated lives of intangible assets, estimates of intangible assets upon measurement, estimated pension liability and fair value of investments. Actual amounts could differ significantly from these estimates. We assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to us and the unknown future impacts of supply chain constraints, inflationary pressures, the energy crisis, currency fluctuations and political tensions as of March 31, 2023 and through the date of this report. The accounting matters assessed included, but were not limited to, the allowance for credit losses, stock-based compensation, carrying value of goodwill, intangibles and other long-lived assets, financial assets, valuation allowances for tax as sets, revenue recognition and costs of revenue. Future conditions related to supply chain constraints, inflationary pressures, the energy crisis, rising interest rates, instability in the financial services industry, currency fluctuations and political tensions could result in further impacts to the Company's consolidated financial statements in future reporting periods
Revision of Previously Issued Financial Statements | Revision of Previously Issued Financial Statements During the fourth quarter of 2023, management identified an immaterial error relating to the understatement of non-controlling interest and the overstatement of accumulated other comprehensive income in the Consolidated Balance Sheet as of December 31, 2022. The immaterial misstatements occurred following the Business Combination between the Company and the Company's majority-owned subsidiary, Adtran Networks on July 15, 2022. The Company incorrectly presented the allocation of foreign currency translation loss attributable to the non-controlling interest during the year ended December 31, 2022. Management evaluated the impact of this error on the Company's full year 2022 consolidated financial statements and determined that the consolidated financial statements were not materially misstated. However, in order to correctly state non-controlling interest and accumulated other comprehensive income in connection with the filing of this Amendment No. 2, the December 31, 2022 balance sheet items have been corrected to reflect the impact of this immaterial error. The Company will revise its consolidated financial statements as of and for the year ended December 31, 2022 when it files its Form 10-K for the period ended December 31, 2023. The following table reflects the impact of the revision to the specific line items presented in the Company's previously reported Condensed Consolidated Balance Sheets and the Condensed Consolidated Statement of Changes in Equity as of December 31, 2022:
|  | December 31, 2022 |
(In thousands) |  | As Reported |  |  | Adjustment |  |  | As Revised |
Accumulated Other Comprehensive Income |  | $ | 46,713 |  |  | $ | (20,587 | ) |  | $ | 26,126 |
Non-Controlling Interest |  | $ | 309,072 |  |  | $ | 20,587 |  |  | $ | 329,659 |
Total Equity |  | $ | 1,303,613 |  |  | $ | — |  |  | $ | 1,303,613 |
The accompanying applicable Notes have been updated to reflect the effects of the revision. Restatement of Previously Issued Financial Statements During the fourth quarter of 2023, the Company determined that it overstated loss attributable to the non-controlling interest, understated loss attributable to the Company, understated loss per common share attributable to ADTRAN Holdings, Inc. – basic and diluted, understated comprehensive loss attributable to non-controlling interest and overstated comprehensive loss attributable to ADTRAN Holdings, Inc., net of tax for the three months ended March 31, 2023. The misstatements occurred following the effectiveness of the DPLTA between the Company and the Company’s majority-owned subsidiary, Adtran Networks upon the registration of the DPLTA with the commercial register on January 16, 2023. Pursuant to the DPLTA, the minority shareholders of Adtran Networks are guaranteed recurring cash compensation commencing with respect to the 2023 fiscal year. The Company incorrectly presented the guaranteed cash compensation attributable to the non-controlling interest as a loss rather than income attributable to the non-controlling interest during the three months ended March 31, 2023. This error resulted in an overstatement of net loss attributable to the non-controlling interest, an understatement of net loss attributable to the Company and loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted, an understated comprehensive loss attributable to non-controlling interest and an overstated comprehensive loss attributable to ADTRAN Holdings, Inc., net of tax. Additionally, this error resulted in an understatement of additional paid-in capital and an overstatement of accumulated other comprehensive income. The Company restated the Condensed Consolidated Statements of Loss presented in this report by increasing net loss attribu table to the Company by $5.6 million for the quarter ended March 31, 2023. The following table reflects the impact of the restatement to the specific line items presented in the Company’s previously reported Condensed Consolidated Statements of Loss and the previously reported Condensed Consolidated Statements of Comprehensive Loss for the three months ended March 31, 2023:
|  | For the Three Months Ended March 31, 2023 |
(In thousands) |  | As Reported |  |  | Adjustment |  |  | As Restated |
Net Loss attributable to non-controlling interest |  | $ | (5,989 | ) |  | $ | 5,619 |  |  | $ | (370 | )
Net Loss attributable to ADTRAN Holdings, Inc. |  | $ | (34,464 | ) |  | $ | (5,619 | ) |  | $ | (40,083 | )
Loss per common share attributable to ADTRAN Holdings, Inc. – basic |  | $ | (0.44 | ) |  | $ | (0.07 | ) |  | $ | (0.51 | )
Loss per common share attributable to ADTRAN Holdings, Inc. – diluted |  | $ | (0.44 | ) |  | $ | (0.07 | ) |  | $ | (0.51 | )
Comprehensive Loss attributable to non-controlling interest |  | $ | 244 |  |  | $ | (232 | ) |  | $ | 12 |
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax |  | $ | (31,915 | ) |  | $ | 232 |  |  | $ | (31,683 | )
The following table reflects the impact of the restatement, in addition to the revision of the December 31, 2022 balances referenced above, to the specific line items presented in the Company’s previously reported Condensed Consolidated Balance Sheets as of March 31, 2023 and the Condensed Consolidated Statement of Changes in Equity for the period ended March 31, 2023:
|  | March 31, 2023 |
(In thousands) |  | As Reported |  |  | Adjustment |  |  | As Restated |
Additional Paid-in Capital |  | $ | 762,035 |  |  | $ | 20,725 |  |  | $ | 782,760 |
Accumulated Other Comprehensive Income |  | $ | 55,251 |  |  | $ | (20,725 | ) |  | $ | 34,526 |
Total Equity |  | $ | 820,162 |  |  | $ | — |  |  | $ | 820,162 |
During the second quarter of 2023, the Company determined that it overstated total current liabilities and understated non-current liabilities as of March 31, 2023 and December 31, 2022, due to a revolving credit agreement being classified as a current liability instead of a non-current liability. The total amount of liabilities remains unchanged. The Company restated the March 31, 2023 Condensed Consolidated Balance Sheet presented in this report by decreasing current revolving credit agreements outstanding by $180.0 million and increasing non-current revolving credit agreement outstanding by $180.0 million. The following table reflects the impact of the restatement to the specific line items presented in the Company’s previously reported condensed consolidated financial statements as of March 31, 2023:
(In thousands) |  | As Reported |  |  | Adjustment |  |  | As Restated |
Revolving credit agreements outstanding |  | $ | 190,843 |  |  | $ | (180,000 | ) |  | $ | 10,843 |
Total current liabilities |  | $ | 522,204 |  |  | $ | (180,000 | ) |  | $ | 342,204 |
Non-current revolving credit agreement outstanding |  | $ | — |  |  | $ | 180,000 |  |  | $ | 180,000 |
The accompanying applicable Notes have been updated to reflect the effects of the restatements as of March 31, 2023.
Redeemable Non-Controlling Interest | Redeemable Non-Controlling Interest As of March 31, 2023 and December 31, 2022, the ADVA stockholders’ equity ownership percentage in ADVA was approximately 34.6% and 34.7%, respectively. As a result of the effectiveness of the DPLTA on January 16, 2023, the ADVA shares, representing the equity interest in ADVA held by holders other than the Company, can be tendered at any time and are, therefore, redeemable and must be classified outside stockholders’ equity. Therefore, the permanent equity noncontrolling interest balance was reclassified to redeemable non-controlling interest ("RNCI") on January 16, 2023 and was remeasured to fair value based on the trading market price of the ADVA shares. Subsequently, the carrying value of the RNCI is adjusted to its maximum redemption value at each reporting date when the maximum redemption value is greater than the initial carrying amount of the redeemable noncontrolling interest. However, the RNCI will be remeasured using the current exchange rate at each reporting date as long as the RNCI is currently redeemable. For the period of time that the DPLTA is in effect, the RNCI will continue to be presented as redeemable non-controlling interest outside of stockholders’ equity in the condensed consolidated balance sheets. See Note 16 for additional information on RNCI.
Recently Adopted Accounting Pronouncements | Recently Adopted Accounting Pronouncements In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2021-08, Business Combinations (Topic 805) Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which would require an acquirer to recognize and measure acquired contract assets and contract liabilities in a manner consistent with how the acquiree recognized and measured them in its pre-acquisition financial statements in accordance with Topic 606, Revenue Recognition. The Company early adopted ASU 2021-08 on July 1, 2022 and the standard was applied retrospectively beginning with January 1, 2022.
Recent Accounting Pronouncements Not Yet Adopted | Recent Accounting Pronouncements Not Yet Adopted There are currently no accounting pronouncements not yet adopted that are expected to have a material effect on the Condensed Consolidated Financial Statements.

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