Principal Accountant Fees and Services - Summary of Principal Accountant Fees and Services (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Auditor's remuneration [abstract]
Audit fees	€ 811	€ 739	€ 814
Audit-related fees	147	0	0
Tax fees	91	122	138
Total principal accountant fees and services	€ 1,049	€ 861	€ 952

Audit-related fees.

No definition available.

Name:	asnd_Audit-RelatedFees
Namespace Prefix:	asnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of fees paid or payable to the entity's auditors.

+ 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

Name:	ifrs-full_AuditorsRemuneration
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	ifrs-full_AuditorsRemunerationAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of fees paid or payable to the entity's auditors for auditing services.

+ References

+ Details

Name:	ifrs-full_AuditorsRemunerationForAuditServices
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of fees paid or payable to the entity's auditors for tax services.

+ References

+ Details

Name:	ifrs-full_AuditorsRemunerationForTaxServices
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration