v3.25.4

Segment Information - Summary of Non-current Segment Assets, Comprise of Intangible Assets, and Property, Plant and Equipment and Investments in Associates, Located by Region (Detail) - EUR (€) € in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Disclosure of operating segments [line items] |  |  |
Non-current segment assets |  | € 182,715 | € 116,317
North America [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Non-current segment assets | [1] | 74,651 | 76,677
Europe [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Non-current segment assets | [1],[2] | € 108,064 | € 39,640
[1] | From 2025, non-current segment assets include investments in associates. Comparatives have been restated for comparative purposes.
[2] | As of December 31, 2025 and December 31, 2024, intangible assets and property, plant and equipment of €33.6 million and €27.9 million, respectively, is located in Denmark, the country of domicile. In addition, as of December 31, 2025 and December 31, 2024, intangible assets and property, plant and equipment of €71.8 million and €11.6 million, respectively, is located in Germany.

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfOperatingSegmentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Classes of financial instruments [domain]; Non-current assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2025-01-01 -Paragraph 33 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_33_b&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=asnd_NorthAmerica1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |