$ADTN
ADTRAN Holdings, Inc. Stock $adtn

$adtn Overview Financials Valuation SEC Filings Company Website

2020 Q3 Form 10-Q Financial Statement

#000156459020052017 Filed on November 06, 2020

Income Statement

Concept	2020 Q3	2019 Q3	2019 Q2
Revenue	$133.1M	$114.1M	$156.4M
YoY Change	16.7%	-18.7%	22.13%
Cost Of Revenue	$74.18M	$67.76M	$91.38M
YoY Change	9.47%	-17.25%	17.07%
Gross Profit	$58.96M	$46.33M	$65.02M
YoY Change	27.26%	-20.73%	30.04%
Gross Profit Margin	44.28%	40.61%	41.57%
Selling, General & Admin	$27.21M	$30.91M	$33.62M
YoY Change	-11.99%	0.53%	4.8%
% of Gross Profit	46.14%	66.72%	51.71%
Research & Development	$27.22M	$31.84M	$32.06M
YoY Change	-14.49%	6.55%	4.34%
% of Gross Profit	46.17%	68.71%	49.32%
Depreciation & Amortization	$3.100M	$3.100M	$3.100M
YoY Change	0.0%	0.0%	-20.51%
% of Gross Profit	5.26%	6.69%	4.77%
Operating Expenses	$54.43M	$62.75M	$65.68M
YoY Change	-13.26%	3.5%	4.58%
Operating Profit	$4.534M	-$20.29M	$562.0K
YoY Change	-122.35%	831.07%	-104.39%
Interest Expense	$3.200M	$128.0K	$127.0K
YoY Change	2400.0%	-4.48%	-3.79%
% of Operating Profit	70.58%		22.6%
Other Income/Expense, Net	-$1.679M	$1.616M	-$205.0K
YoY Change	-203.9%	703.98%	-5.53%
Pretax Income	$6.043M	-$18.41M	$3.407M
YoY Change	-132.83%	-671.61%	-130.26%
Income Tax	$562.0K	$27.72M	-$588.0K
% Of Pretax Income	9.3%		-17.26%
Net Earnings	$5.481M	-$46.12M	$3.995M
YoY Change	-111.88%	-707.76%	-152.09%
Net Earnings / Revenue	4.12%	-40.43%	2.55%
Basic Earnings Per Share	$0.11	-$0.96	$0.08
Diluted Earnings Per Share	$0.11	-$0.96	$0.08
COMMON SHARES
Basic Shares Outstanding	47.96M	47.82M	47.80M
Diluted Shares Outstanding	48.42M	47.82M	48.04M

Balance Sheet

Concept	2020 Q3	2019 Q3	2019 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$77.30M	$125.2M	$137.7M
YoY Change	-38.26%	25.07%	29.42%
Cash & Equivalents	$71.08M	$96.41M	$106.8M
Short-Term Investments	$6.200M	$28.80M	$30.90M
Other Short-Term Assets	$8.700M	$10.30M	$8.900M
YoY Change	-15.53%	-0.96%	-6.32%
Inventory	$120.3M	$104.9M	$95.11M
Prepaid Expenses
Receivables	$100.2M	$90.65M	$116.7M
Other Receivables	$21.90M	$18.93M	$24.98M
Total Short-Term Assets	$329.3M	$350.0M	$383.4M
YoY Change	-5.92%	0.43%	12.53%
LONG-TERM ASSETS
Property, Plant & Equipment	$64.35M	$73.38M	$78.81M
YoY Change	-12.31%	-9.96%	-4.94%
Goodwill		$6.968M	$6.968M
YoY Change			99.54%
Intangibles		$29.11M	$30.50M
YoY Change
Long-Term Investments	$78.00M	$90.60M	$87.30M
YoY Change	-13.91%	-37.17%	-39.54%
Other Assets	$22.80M	$23.28M	$13.82M
YoY Change	-2.07%	-50.36%	-57.38%
Total Long-Term Assets	$202.1M	$229.9M	$256.4M
YoY Change	-12.08%	-23.45%	-14.21%
TOTAL ASSETS
Total Short-Term Assets	$329.3M	$350.0M	$383.4M
Total Long-Term Assets	$202.1M	$229.9M	$256.4M
Total Assets	$531.4M	$579.9M	$639.8M
YoY Change	-8.36%	-10.62%	0.03%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$59.90M	$52.84M	$63.83M
YoY Change	13.36%	-18.7%	6.11%
Accrued Expenses	$30.40M	$15.70M	$14.33M
YoY Change	93.67%	-42.29%	-3.07%
Deferred Revenue		$14.02M	$12.91M
YoY Change		-17.54%	-9.76%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$25.60M	$25.60M
YoY Change	-100.0%
Total Short-Term Liabilities	$107.0M	$128.2M	$145.4M
YoY Change	-16.5%	3.77%	25.21%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change		-100.0%	-100.0%
Other Long-Term Liabilities	$54.80M	$52.19M	$44.18M
YoY Change	5.0%	44.57%	15.66%
Total Long-Term Liabilities	$54.80M	$52.19M	$44.18M
YoY Change	5.0%	-15.41%	-30.75%
TOTAL LIABILITIES
Total Short-Term Liabilities	$107.0M	$128.2M	$145.4M
Total Long-Term Liabilities	$54.80M	$52.19M	$44.18M
Total Liabilities	$161.8M	$184.9M	$193.8M
YoY Change	-12.5%	-0.15%	7.73%
SHAREHOLDERS EQUITY
Retained Earnings		$827.8M	$878.6M
YoY Change		-8.06%
Common Stock		$273.7M	$271.8M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)		$690.0M	$690.3M
YoY Change
Treasury Stock Shares		$31.83M	$31.84M
Shareholders Equity	$369.6M	$395.0M	$446.0M
YoY Change
Total Liabilities & Shareholders Equity	$531.4M	$579.9M	$639.8M
YoY Change	-8.36%	-10.62%	0.03%

Cashflow Statement

Concept	2020 Q3	2019 Q3	2019 Q2
OPERATING ACTIVITIES
Net Income	$5.481M	-$46.12M	$3.995M
YoY Change	-111.88%	-707.76%	-152.09%
Depreciation, Depletion And Amortization	$3.100M	$3.100M	$3.100M
YoY Change	0.0%	0.0%	-20.51%
Cash From Operating Activities	-$7.000M	-$900.0K	$1.300M
YoY Change	677.78%	-78.57%	-80.6%
INVESTING ACTIVITIES
Capital Expenditures	-$2.000M	-$1.700M	-$2.400M
YoY Change	17.65%	13.33%	9.09%
Acquisitions
YoY Change
Other Investing Activities	$12.10M	-$1.400M	$2.100M
YoY Change	-964.29%	-128.57%	-91.06%
Cash From Investing Activities	$10.10M	-$3.200M	-$300.0K
YoY Change	-415.62%	-194.12%	-101.42%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-4.300M	-4.300M	-3.800M
YoY Change	0.0%	-8.51%	-44.93%
NET CHANGE
Cash From Operating Activities	-7.000M	-900.0K	1.300M
Cash From Investing Activities	10.10M	-3.200M	-300.0K
Cash From Financing Activities	-4.300M	-4.300M	-3.800M
Net Change In Cash	-1.200M	-8.400M	-2.800M
YoY Change	-85.71%	52.73%	-113.33%
FREE CASH FLOW
Cash From Operating Activities	-$7.000M	-$900.0K	$1.300M
Capital Expenditures	-$2.000M	-$1.700M	-$2.400M
Free Cash Flow	-$5.000M	$800.0K	$3.700M
YoY Change	-725.0%	-129.63%	-58.43%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
	us-gaap	Lessee Operating Lease Existence Of Option To Extend LesseeOperatingLeaseExistenceOfOptionToExtend	true
	us-gaap	Lessee Operating Lease Existence Of Option To Terminate LesseeOperatingLeaseExistenceOfOptionToTerminate	true
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y4M24D
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y8M12D
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y8M12D
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssetsNoncurrent
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssetsNoncurrent
CY2020Q3	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:AccruedLiabilitiesCurrent
CY2019Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:AccruedLiabilitiesCurrent
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	65000
	adtn	Gain Loss On Contingency GainLossOnContingency	1230000
CY2019Q3	us-gaap	Gross Profit GrossProfit	46331000
CY2020Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	7865000
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	114092000
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	79652000
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	48020000
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	31636000
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	212347000
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3872000
CY2020Q3	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	344000
	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	95546000
CY2019Q3	us-gaap	Interest Expense InterestExpense	128000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	445000
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.08
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.08
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-576000
	us-gaap	Net Income Loss NetIncomeLoss	-3736000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2718000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3000
CY2020Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1655000
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	364194000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	380426000
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-9969000
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1392000
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2020Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4328000
CY2020Q1	adtn	Unvested Performance Stock Units Dividends Accrual Adjustment For Market Changes UnvestedPerformanceStockUnitsDividendsAccrualAdjustmentForMarketChanges	-32000
CY2020Q1	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2758000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47803000
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	363715000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	752000
CY2020Q1	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	23000
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1791000
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.87
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.87
	us-gaap	Net Income Loss NetIncomeLoss	-41358000
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	277000
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-361000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-3113000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2475000
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-43833000
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2463000
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2020Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4337000
CY2020Q2	adtn	Unvested Performance Stock Units Dividends Accrual Adjustment For Market Changes UnvestedPerformanceStockUnitsDividendsAccrualAdjustmentForMarketChanges	-28000
CY2020Q2	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	24000
CY2020Q2	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	2000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5481000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2668000
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4328000
CY2020Q3	adtn	Unvested Performance Stock Units Dividends Accrual Adjustment For Market Changes UnvestedPerformanceStockUnitsDividendsAccrualAdjustmentForMarketChanges	-12000
CY2020Q3	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	12000
CY2020Q3	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	8000
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1610000
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	369593000
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	446279000
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	770000
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-854000
CY2019Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2019Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4301000
CY2019Q1	adtn	Unvested Performance Stock Units Dividends Accrual Adjustment For Market Changes UnvestedPerformanceStockUnitsDividendsAccrualAdjustmentForMarketChanges	-18000
CY2019Q1	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	8000
CY2019Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	184000
CY2019Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1859000
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	443547000
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	3995000
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	790000
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2019Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4303000
CY2019Q2	adtn	Unvested Performance Stock Units Dividends Accrual Adjustment For Market Changes UnvestedPerformanceStockUnitsDividendsAccrualAdjustmentForMarketChanges	-34000
CY2019Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	526000
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1454000
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	445975000
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-46123000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2411000
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4304000
CY2019Q3	adtn	Unvested Performance Stock Units Dividends Accrual Adjustment For Market Changes UnvestedPerformanceStockUnitsDividendsAccrualAdjustmentForMarketChanges	42000
CY2019Q3	adtn	Stock Vested During Period Value Restricted Stock Performance Stock Units And Restricted Stock Units StockVestedDuringPeriodValueRestrictedStockPerformanceStockUnitsAndRestrictedStockUnits	95000
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1871000
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	394955000
	us-gaap	Profit Loss ProfitLoss	-3736000
	us-gaap	Profit Loss ProfitLoss	-41358000
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	12525000
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	13315000
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	65000
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3872000
	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-90000
	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	86000
	us-gaap	Gain Loss On Investments GainLossOnInvestments	1819000
	us-gaap	Gain Loss On Investments GainLossOnInvestments	8195000
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-105000
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-58000
	adtn	Gain Loss On Contingency GainLossOnContingency	1230000
	us-gaap	Gain Loss On Sale Of Insurance Block GainLossOnSaleOfInsuranceBlock	1000000
	us-gaap	Share Based Compensation ShareBasedCompensation	5056000
	us-gaap	Share Based Compensation ShareBasedCompensation	5184000
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1000
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	30421000
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	9131000
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-7603000
	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	6224000
	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	-17645000
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	21170000
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	5998000
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	672000
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	10071000
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	14204000
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-5569000
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	5618000
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	10564000
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-227000
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-5073000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-5317000
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	10082000
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5082000
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6008000
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	86145000
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	38561000
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	42641000
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	37223000
	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	523000
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1000000
	adtn	Payments For Proceeds From Business Acquisition PaymentsForProceedsFromBusinessAcquisition	-13000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	37899000
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3657000
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	12993000
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	12908000
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	24600000
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	526000
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	184000
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-37593000
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-12566000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-5011000
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-6141000
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2641000
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-2956000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	73773000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	105504000
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	71403000
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	96407000
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	442000
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	135000
	us-gaap	Use Of Estimates UseOfEstimates	<p style="text-align:justify;margin-top:10pt;margin-bottom:0pt;text-indent:0%;font-weight:bold;font-family:Times New Roman;font-size:10pt;font-style:normal;text-transform:none;font-variant: normal;">Use of Estimates</p> <p style="text-align:justify;margin-top:10pt;margin-bottom:0pt;text-indent:0%;font-family:Times New Roman;font-size:10pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">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. The more significant estimates include excess and obsolete inventory reserves, warranty reserves, customer rebates, determination and accrual of deferred revenue components of multi-element sales agreements, 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, estimated pension liability and fair value of investments. Actual amounts could differ significantly from these estimates.</p> <p style="text-align:justify;margin-top:10pt;margin-bottom:0pt;text-indent:0%;font-family:Times New Roman;font-size:10pt;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">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 the novel coronavirus (“COVID-19”) as of September 30, 2020 and through the date of this report. The accounting matters assessed included, but were not limited to, the allowance for doubtful accounts, current estimated credit losses, stock-based compensation, excess and obsolete inventory reserves, carrying value of goodwill, intangibles and other long-lived assets, financial assets, valuation allowances for tax assets and revenue recognition. While there was not a material impact to our condensed consolidated financial statements as of and for the three and nine month periods ended September 30, 2020 resulting from these assessments, future conditions related to the magnitude and duration of the COVID-19 pandemic, as well as other factors, could result in material impacts to our consolidated financial statements in future reporting periods.</p>
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1000000.0
CY2020Q3	us-gaap	Hosting Arrangement Service Contract Implementation Cost Capitalized Before Accumulated Amortization HostingArrangementServiceContractImplementationCostCapitalizedBeforeAccumulatedAmortization	10455000
CY2020Q3	us-gaap	Hosting Arrangement Service Contract Implementation Cost Capitalized After Accumulated Amortization HostingArrangementServiceContractImplementationCostCapitalizedAfterAccumulatedAmortization	10455000
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	71081000
CY2020Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	322000
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	71403000
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	0
	adtn	Number Of Product Categories NumberOfProductCategories	3
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	133143000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	376381000
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.59
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P12M
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	90531000
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	2812000
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	11963000
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	6012000
CY2019Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	1200000
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	9600000
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	3851000
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	3949000
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	11700000
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	1.506
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.093
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	1.971
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.368
CY2020Q3	adtn	Additional Change In Valuation Allowances Related To Domestic Operations AdditionalChangeInValuationAllowancesRelatedToDomesticOperations	1000000.0
CY2020Q3	adtn	Additional Income Tax Expense Benefit Result Of Cares Act Of2020 AdditionalIncomeTaxExpenseBenefitResultOfCARESActOf2020	400000
CY2019Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.071
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.071
	adtn	Income Tax Expense Benefit Result Of Cares Act Of2020 IncomeTaxExpenseBenefitResultOfCARESActOf2020	-7800000
CY2020Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	59100000
CY2020Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	51200000
CY2020Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	7900000
CY2020Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	59104000
CY2020Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	51239000
CY2020Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	7865000
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	56177000
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	48616000
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	7561000
CY2020Q3	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	325000
CY2019Q3	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	366000
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	942000
	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1109000
CY2020Q3	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	113000
CY2019Q3	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	158000
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	329000
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	479000
CY2020Q3	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	429000
CY2019Q3	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	346000
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1246000
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1049000
CY2020Q3	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-248000
CY2019Q3	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-198000
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-720000
	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-600000
CY2020Q3	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	257000
CY2019Q3	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	376000
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	745000
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	1139000
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1610000
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1871000
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5056000
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5184000
CY2020Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	384000
CY2019Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	446000
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1205000
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1235000
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1226000
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1425000
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3572000
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.88
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	352000
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	21.48
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3220000
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.94
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	3217000
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	22.95
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	0
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1891000
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	14.58
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	399000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	8.21
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	15000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	12.76
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	586000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	18.24
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1689000
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	11.83
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3600000
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	44284000
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	601000
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	12000
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	44873000
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	37528000
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	153000
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	21000
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	37660000
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	70000
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	36000
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	303000
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	85000
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	6000
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	7000
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	45000
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	40000
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	64000
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	29000
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	258000
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	45000
	us-gaap	Debt Securities Available For Sale Purchased With Credit Deterioration Amount At Purchase Price DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice	0
CY2020Q3	us-gaap	Debt Securities Available For Sale Purchased With Credit Deterioration Amount At Purchase Price DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice	0
CY2019Q1	us-gaap	Transfer Of Investments TransferOfInvestments	3400000
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	3400000
CY2020Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	1800000
CY2020Q3	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	623000
CY2019Q3	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	-20000
	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	-1485000
	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	-83000
CY2020Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	2157000
CY2019Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-225000
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	3046000
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	8233000
CY2020Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	2780000
CY2019Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-245000
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	1561000
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	8150000
CY2020Q3	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	43418000
CY2019Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	36987000
CY2020Q3	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	1787000
CY2019Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	1085000
CY2020Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	75055000
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	60233000
CY2020Q3	us-gaap	Inventory Net InventoryNet	120260000
CY2019Q4	us-gaap	Inventory Net InventoryNet	98305000
CY2020Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	38000000.0
CY2019Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	34100000
CY2020Q3	us-gaap	Land Land	4575000
CY2019Q4	us-gaap	Land Land	4575000
CY2020Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	35105000
CY2019Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	34797000
CY2020Q3	adtn	Building Building	68160000
CY2019Q4	adtn	Building Building	68157000
CY2020Q3	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	19981000
CY2019Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	19959000
CY2020Q3	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	70766000
CY2019Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	68777000
CY2020Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	132672000
CY2019Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	130430000
CY2020Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	331259000
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	326695000
CY2020Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	266906000
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	258609000
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	64353000
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	68086000
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0
CY2019Q3	us-gaap	Depreciation Depreciation	3100000
CY2020Q3	us-gaap	Depreciation Depreciation	3100000
	us-gaap	Depreciation Depreciation	9100000
	us-gaap	Depreciation Depreciation	9300000
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	7000000.0
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	7000000.0
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2020Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	39101000
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	14636000
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	24465000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	42596000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	14775000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	27821000
CY2020Q2	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1000000.0
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1300000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3400000
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000.0
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	1041000
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	4107000
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	3482000
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	3330000
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	3236000
CY2020Q3	adtn	Finite Lived Intangible Assets Amortization Expense After Year Four FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour	9269000
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	24465000
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5503000
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	8452000
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	5519000
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	8494000
CY2020Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	6000
CY2019Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	100000
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	20000
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	300000
CY2020Q3	us-gaap	Variable Lease Cost VariableLeaseCost	100000
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	300000
	us-gaap	Variable Lease Cost VariableLeaseCost	400000
	us-gaap	Variable Lease Cost VariableLeaseCost	700000
CY2020Q3	us-gaap	Operating Lease Expense OperatingLeaseExpense	654000
CY2019Q3	us-gaap	Operating Lease Expense OperatingLeaseExpense	1215000
	us-gaap	Operating Lease Expense OperatingLeaseExpense	1975000
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5503000
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	8452000
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1731000
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2676000
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	3788000
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	5818000
	us-gaap	Operating Lease Expense OperatingLeaseExpense	2830000
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	518000
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2856000
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1744000
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2412000
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1514000
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1705000
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1180000
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1160000
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	499000
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	482000
CY2020Q3	adtn	Lessee Operating Lease Liability Payments Due After Year Four LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour	276000
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	264000
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	5731000
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	8879000
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	212000
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	385000
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	5519000
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	8494000
CY2020Q3	adtn	Lessee Option To Extend Operating Lease Payments LesseeOptionToExtendOperatingLeasePayments	300000
CY2019Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	775000
	us-gaap	Operating Lease Payments OperatingLeasePayments	2059000
	us-gaap	Operating Lease Payments OperatingLeasePayments	2383000
CY2020Q3	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	138000
CY2019Q3	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	11022000
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	231000
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	21418000
CY2020Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	582000
CY2020Q3	adtn	Sales Type Lease Lease Receivable Current SalesTypeLeaseLeaseReceivableCurrent	811000
CY2019Q4	adtn	Sales Type Lease Lease Receivable Current SalesTypeLeaseLeaseReceivableCurrent	1201000
CY2020Q3	adtn	Sales Type Lease Lease Receivable Noncurrent SalesTypeLeaseLeaseReceivableNoncurrent	450000
CY2019Q4	adtn	Sales Type Lease Lease Receivable Noncurrent SalesTypeLeaseLeaseReceivableNoncurrent	889000
CY2020Q3	us-gaap	Sales Type Lease Lease Receivable SalesTypeLeaseLeaseReceivable	1261000
CY2019Q4	us-gaap	Sales Type Lease Lease Receivable SalesTypeLeaseLeaseReceivable	2090000
CY2020Q3	adtn	Sales Type Leases Unearned Revenue Current SalesTypeLeasesUnearnedRevenueCurrent	235000
CY2019Q4	adtn	Sales Type Leases Unearned Revenue Current SalesTypeLeasesUnearnedRevenueCurrent	365000
CY2020Q3	adtn	Sales Type Leases Unearned Revenue Noncurrent SalesTypeLeasesUnearnedRevenueNoncurrent	70000
CY2019Q4	adtn	Sales Type Leases Unearned Revenue Noncurrent SalesTypeLeasesUnearnedRevenueNoncurrent	163000
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	956000
CY2019Q4	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	1562000
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0
CY2020Q3	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	2500000
CY2020Q3	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	5000000.0
CY2020Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	2963000
CY2020Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	295000
CY2020Q3	adtn	Other Comprehensive Income Loss Net Of Tax Due To Changes In Accounting Standard OtherComprehensiveIncomeLossNetOfTaxDueToChangesInAccountingStandard	2668000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-2525000
CY2019Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-114000
CY2019Q3	adtn	Other Comprehensive Income Loss Net Of Tax Due To Changes In Accounting Standard OtherComprehensiveIncomeLossNetOfTaxDueToChangesInAccountingStandard	-2411000
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	3162000
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-577000
	adtn	Other Comprehensive Income Loss Net Of Tax Due To Changes In Accounting Standard OtherComprehensiveIncomeLossNetOfTaxDueToChangesInAccountingStandard	3739000
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-2741000
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-266000
	adtn	Cumulative Effect On Reclassification From Aoci To Retained Earnings Due To Changes In Accounting Standard CumulativeEffectOnReclassificationFromAOCIToRetainedEarningsDueToChangesInAccountingStandard	385000
	adtn	Other Comprehensive Income Loss Net Of Tax Due To Changes In Accounting Standard OtherComprehensiveIncomeLossNetOfTaxDueToChangesInAccountingStandard	-2090000
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	668000
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	174000
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	494000
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-53000
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-14000
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-39000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	728000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	189000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	539000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-32000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-8000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-24000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	354000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	110000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	244000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	130000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	40000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	90000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	2469000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2469000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-2486000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-2486000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47957000
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47803000
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	467000
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48424000
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47824000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	2763000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	95000
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2668000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-2377000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	34000
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2411000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	600000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	156000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	444000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	503000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	131000
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	372000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-1000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-1000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	128000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	33000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	95000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	835000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	259000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	576000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	523000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	162000
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	361000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	2718000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2718000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-3113000
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-3113000
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	4154000
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	415000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3739000
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-2215000
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	260000
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2475000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5481000
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-46123000
	us-gaap	Net Income Loss NetIncomeLoss	-3736000
	us-gaap	Net Income Loss NetIncomeLoss	-41358000
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47957000
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47824000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47957000
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47803000
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.96
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.08
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.87
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.96
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.08
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.87
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3400000
	adtn	Commitments Related To Performance Bonds Expiration Month And Year CommitmentsRelatedToPerformanceBondsExpirationMonthAndYear	2024-08
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	414274000
	us-gaap	Standard Product Warranty Description StandardProductWarrantyDescription	90 days to five years
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7200000
CY2019Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8400000
CY2019Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3900000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4300000
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2800000
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	133143000
CY2020Q3	us-gaap	Gross Profit GrossProfit	58962000
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	114092000
CY2019Q3	us-gaap	Gross Profit GrossProfit	46331000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	376381000
	us-gaap	Gross Profit GrossProfit	164034000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	414274000
	us-gaap	Gross Profit GrossProfit	171958000
	adtn	Number Of Product Categories NumberOfProductCategories	3
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	133143000
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	114092000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	376381000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	414274000
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	133143000
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	114092000
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	376381000
CY2020Q2	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7294000
CY2019Q2	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8972000
CY2019Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8394000
CY2018Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8623000
CY2020Q3	adtn	Product Warranty Accrual Increase Decrease For Warranties Issued ProductWarrantyAccrualIncreaseDecreaseForWarrantiesIssued	632000
CY2019Q3	adtn	Product Warranty Accrual Increase Decrease For Warranties Issued ProductWarrantyAccrualIncreaseDecreaseForWarrantiesIssued	816000
	adtn	Product Warranty Accrual Increase Decrease For Warranties Issued ProductWarrantyAccrualIncreaseDecreaseForWarrantiesIssued	970000
	adtn	Product Warranty Accrual Increase Decrease For Warranties Issued ProductWarrantyAccrualIncreaseDecreaseForWarrantiesIssued	3796000
CY2020Q3	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	734000
CY2019Q3	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	1131000
	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	2172000
	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	3762000
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7192000
CY2019Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8657000
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7192000
CY2019Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8657000
CY2020Q3	adtn	Commitments Related To Performance Bonds CommitmentsRelatedToPerformanceBonds	12000000.0
CY2019Q4	adtn	Commitments Related To Performance Bonds CommitmentsRelatedToPerformanceBonds	9300000
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease Allowance For Credit Loss Writeoff SalesTypeLeaseNetInvestmentInLeaseAllowanceForCreditLossWriteoff	0
CY2020Q1	us-gaap	Sales Type Lease Net Investment In Lease Allowance For Credit Loss Writeoff SalesTypeLeaseNetInvestmentInLeaseAllowanceForCreditLossWriteoff	0
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	4864000
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	12000
CY2020Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	8965000
CY2020Q3	adtn	Letter Of Credit Secured By Pledge Of Portion Of Fixed Income Securities LetterOfCreditSecuredByPledgeOfPortionOfFixedIncomeSecurities	5900000
CY2020Q3	adtn	Commitments Towards Private Equity Funds CommitmentsTowardsPrivateEquityFunds	4900000
CY2020Q1	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	90500000
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	100200000
CY2020Q1	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	0
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	0
	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	0
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	38000
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	38000
CY2020Q1	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	2800000
CY2020Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	1000000.0
CY2020Q3	us-gaap	Contract With Customer Asset Allowance For Credit Loss Writeoff ContractWithCustomerAssetAllowanceForCreditLossWriteoff	0
CY2020Q1	us-gaap	Contract With Customer Asset Allowance For Credit Loss Writeoff ContractWithCustomerAssetAllowanceForCreditLossWriteoff	0
	us-gaap	Contract With Customer Asset Allowance For Credit Loss Writeoff ContractWithCustomerAssetAllowanceForCreditLossWriteoff	0
CY2020Q1	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	1600000
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	1000000.0
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease Originated In Current Fiscal Year SalesTypeLeaseNetInvestmentInLeaseOriginatedInCurrentFiscalYear	58000
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease Originated In Fiscal Year Before Latest Fiscal Year SalesTypeLeaseNetInvestmentInLeaseOriginatedInFiscalYearBeforeLatestFiscalYear	227000
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease Originated Two Years Before Latest Fiscal Year SalesTypeLeaseNetInvestmentInLeaseOriginatedTwoYearsBeforeLatestFiscalYear	426000
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease Originated Three Years Before Latest Fiscal Year SalesTypeLeaseNetInvestmentInLeaseOriginatedThreeYearsBeforeLatestFiscalYear	153000
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease Originated Four Years Before Latest Fiscal Year SalesTypeLeaseNetInvestmentInLeaseOriginatedFourYearsBeforeLatestFiscalYear	89000
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease Originated Five Or More Years Before Latest Fiscal Year SalesTypeLeaseNetInvestmentInLeaseOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3000
CY2020Q3	us-gaap	Sales Type Lease Net Investment In Lease SalesTypeLeaseNetInvestmentInLease	956000
	us-gaap	Sales Type Lease Net Investment In Lease Allowance For Credit Loss Writeoff SalesTypeLeaseNetInvestmentInLeaseAllowanceForCreditLossWriteoff	0
CY2020Q3	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	900000
CY2020Q1	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	900000
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	0
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	0
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	0
CY2020Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	37700000
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	44900000
CY2020Q1	us-gaap	Interest Receivable Current InterestReceivableCurrent	100000
CY2020Q3	us-gaap	Interest Receivable Current InterestReceivableCurrent	100000
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	45
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	4864000
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	12000
CY2020Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	19000
CY2020Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	136000
CY2020Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	2000
CY2020Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	9101000
CY2020Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	21000
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2020Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2020Q2	us-gaap	Restructuring Reserve RestructuringReserve	358000
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	1568000
CY2020Q3	us-gaap	Restructuring Charges RestructuringCharges	1903000
	us-gaap	Restructuring Charges RestructuringCharges	3648000
CY2020Q3	us-gaap	Payments For Restructuring PaymentsForRestructuring	542000
	us-gaap	Payments For Restructuring PaymentsForRestructuring	3497000
CY2020Q3	us-gaap	Restructuring Reserve RestructuringReserve	1719000
CY2020Q3	us-gaap	Restructuring Reserve RestructuringReserve	1719000
CY2018Q4	us-gaap	Restructuring Reserve RestructuringReserve	185000
CY2019	us-gaap	Restructuring Charges RestructuringCharges	6014000
CY2019	us-gaap	Payments For Restructuring PaymentsForRestructuring	4631000
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	1568000
CY2020Q3	us-gaap	Restructuring Charges RestructuringCharges	1903000
CY2019Q3	us-gaap	Restructuring Charges RestructuringCharges	1195000
	us-gaap	Restructuring Charges RestructuringCharges	3648000
	us-gaap	Restructuring Charges RestructuringCharges	4658000
CY2020Q3	us-gaap	Restructuring Charges RestructuringCharges	1903000
CY2019Q3	us-gaap	Restructuring Charges RestructuringCharges	1195000
	us-gaap	Restructuring Charges RestructuringCharges	3648000
	us-gaap	Restructuring Charges RestructuringCharges	4658000
	us-gaap	Restructuring Costs RestructuringCosts	9700000

Files In Submission

Name	View Source	Status
0001564590-20-052017-index-headers.html	Edgar Link	pending
0001564590-20-052017-index.html	Edgar Link	pending
0001564590-20-052017.txt	Edgar Link	pending
0001564590-20-052017-xbrl.zip	Edgar Link	pending
adtn-10q_20200930.htm	Edgar Link	pending
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adtn-20200930.xsd	Edgar Link	pending
adtn-20200930_cal.xml	Edgar Link	unprocessable
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adtn-20200930_pre.xml	Edgar Link	unprocessable
adtn-ex101_168.htm	Edgar Link	pending
adtn-ex102_169.htm	Edgar Link	pending
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adtn-ex104_171.htm	Edgar Link	pending
adtn-ex31_8.htm	Edgar Link	pending
adtn-ex32_7.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$ADTN
ADTRAN Holdings, Inc. Stock $adtn

2020 Q3 Form 10-Q Financial Statement

#000156459020052017 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ADTN ADTRAN Holdings, Inc. Stock $adtn

2020 Q3 Form 10-Q Financial Statement

#000156459020052017 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ADTN
ADTRAN Holdings, Inc. Stock $adtn