v3.25.4

Share-based Payment - Schedule of Warrant Activity (Parenthetical) (Detail) - € / shares | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
U.S. dollars [member] |  |  |
Disclosure Of Warrant Activity [line items] |  |  |
Weighted average share price | € 162.08 | € 135.86 | € 98.1

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- Definition Disclosure Of Warrant Activity [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 weighted average share price. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 45 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_c&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_WeightedAverageSharePrice2019
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_CurrencyAxis=asnd_USDollarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |