XML 28 R17.htm IDEA: XBRL DOCUMENT
v3.21.2

Goodwill | 6 Months Ended
--- | ---
Jun. 30, 2021
Goodwill Disclosure [Abstract] |
Goodwill | 9. GOODWILL Goodwill was $7.0 million as of June 30, 2021 and December 31, 2020, of which $6.6 million and $0.4 million was allocated to our Network Solutions and Services & Support reportable segments, respectively. The Company evaluates the carrying value of goodwill during the fourth quarter of each year and between annual evaluations if events occur or circumstances change that could more likely than not reduce the fair value of the reporting unit below its carrying amount. We assess qualitative factors to determine whether the fair value of the reporting unit to which the goodwill is assigned is less than its carrying amount and recognize an impairment charge for the amount by which the carrying value exceeds the fair value of the reporting unit. Due to the current economic environment, particularly related to COVID-19, the Company performed a triggering event assessment during the second quarters of 2021 and 2020, in which no triggers were identified. Therefore, no interim impairment test of goodwill was performed as of June 30, 2021 or 2020, and no impairment of goodwill was recorded during the three or six months ended June 30, 2021 or 2020.

X
- Definition Goodwill disclosure. + References No definition available. + Details
Name: | adtn_GoodwillDisclosureAbstract
Namespace Prefix: | adtn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
Name: | us-gaap_GoodwillDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration