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Leases - Net Investment in Sales-Type Leases (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Sales Type Leases Net Investment In Leases [Abstract] |  |
Current minimum lease payments receivable | $ 129 | $ 702
Non-current minimum lease payments receivable | 7 | 347
Total minimum lease payments receivable | 136 | 1,049
Less: Current unearned revenue | 98 | 218
Less: Non-current unearned revenue | 1 | 50
Net investment in sales-type leases | $ 37 | $ 781

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- Definition Sales type lease, lease receivable current. + References No definition available. + Details
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Balance Type: | debit
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- Definition Sales type lease, lease receivable noncurrent. + References No definition available. + Details
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Namespace Prefix: | adtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Sales type leases unearned revenue current. + References No definition available. + Details
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Namespace Prefix: | adtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Sales type leases unearned revenue noncurrent. + References No definition available. + Details
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Namespace Prefix: | adtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919379-209981 + Details
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- Definition Amount of net investment in sales-type lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919379-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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