XML 73 R62.htm IDEA: XBRL DOCUMENT
v3.20.2

Stock-Based Compensation (PSUs, RSUs and Restricted Stock) - Additional Information (Detail) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2020 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Options available for issuance under stockholders-approved equity plan | 3,400,000
2015 Employee Stock Incentive Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Number of additional shares of common stock granted | 0
2010 Directors Stock Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Number of additional shares of common stock granted | 0
2020 Employee Incentive Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Number of shares of common stock authorized | 2,800,000
Multiplier used when issuing PSUs, restricted stock and RSUs | 1
Contractual term | 10 years
2020 Directors Stock Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Number of shares of common stock authorized | 400,000
Multiplier used when issuing PSUs, restricted stock and RSUs | 1
Contractual term | 10 years
2010 Directors Stock Plan to 2020 Directors Stock Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Forfeiture of stock increase in issuance of common stock | 1
Performance Stock Units (PSUs) [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Share issued | 300,000
Performance target period | 3 years
Performance Stock Units (PSUs) [Member] | Minimum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Percentage of performance stock units granted | 0.00%
Performance Stock Units (PSUs) [Member] | Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Percentage of performance stock units granted | 142.80%
Market-Based PSUs, RSUs and Restricted Stock [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Unrecognized compensation expense related to other than options | $ | $ 12.7
Recognition period of unvested compensation expense | 2 years 6 months
PSUs, RSUs and Restricted Stock [Member] | 2020 Employee Incentive Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period | 4 years
PSUs, RSUs and Restricted Stock [Member] | 2015 Employee Incentive Plan to 2020 Employee Incentive Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Forfeiture of stock increase in issuance of common stock | 2.5
Options | 2020 Employee Incentive Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period | 4 years

X
- Definition Share based compensation arrangement by share based payment award earn out percentage. + References No definition available. + Details
Name: | adtn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEarnOutPercentage
Namespace Prefix: | adtn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award forfeiture of common stock multiplier used in determining issuable shares. + References No definition available. + Details
Name: | adtn_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureOfCommonStockMultiplierUsedInDeterminingIssuableShares
Namespace Prefix: | adtn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share based compensation arrangement by share based payment award number of additional shares granted. + References No definition available. + Details
Name: | adtn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesGranted
Namespace Prefix: | adtn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award performance target period. + References No definition available. + Details
Name: | adtn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceTargetPeriod
Namespace Prefix: | adtn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based compensation arrangement by share-based payment award, common stock multiplier used in determining issuable shares. + References No definition available. + Details
Name: | adtn_SharebasedCompensationArrangementBySharebasedPaymentAwardCommonStockMultiplierUsedInDeterminingIssuableShares
Namespace Prefix: | adtn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=adtn_TwoThousandAndFifteenEmployeeStockIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=adtn_TwoThousandAndTenDirectorsStockPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=adtn_TwoThousandTwentyEmployeeIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=adtn_TwoThousandTwentyDirectorsStockPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=adtn_TwoThousandAndTenToTwoThousandTwentyDirectorsStockPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=adtn_PerformanceStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=adtn_MarketBasedPerformanceStockUnitsRestrictedStockUnitsAndRestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=adtn_TwoThousandAndFifteenToTwoThousandTwentyEmployeeIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |