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Segment and geographic information - Long-lived Assets by Region (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Segment Reporting Information [Line Items] |  |
Total long-lived assets | $ 20,688 | $ 9,754
North America |  |
Segment Reporting Information [Line Items] |  |
Total long-lived assets | 14,590 | 6,922
Rest of world |  |
Segment Reporting Information [Line Items] |  |
Total long-lived assets | $ 6,098 | $ 2,832

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 + Details
Name: | us-gaap_NoncurrentAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=srt_NorthAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=udmy_RestOfWorldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |