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Commitments and Contingencies - Additional Information (Detail) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Leasehold improvements [member] |  |
Disclosure of commitments and contingencies [line items] |  |
Contractual commitments | € 0.3 | € 1.2

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- Definition Disclosure of commitments and contingencies [line items] + References No definition available. + Details
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Namespace Prefix: | asnd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |