v3.25.4
Investments in Group Enterprises and Associates - Summary of Investments in Group Enterprises and Associates (Detail)
1 Months Ended 12 Months Ended
Mar. 21, 2025
Mar. 19, 2025
Jan. 31, 2025
Jan. 31, 2024
Nov. 30, 2018
Dec. 31, 2025
Dec. 31, 2024
Ascendis Pharma GmbH [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma GmbH  
Ownership           100.00%  
Ascendis Pharma Endocrinology GmbH [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Endocrinology GmbH  
Ownership           100.00%  
Ascendis Pharma, LLC [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma, LLC  
Ownership           100.00%  
Ascendis Pharma Endocrinology, Inc. [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Endocrinology, Inc.  
Ownership           100.00%  
Ascendis Pharma Ophthalmology Division A/S [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma, Ophthalmology Division A/S  
Ownership           100.00%  
Ascendis Pharma Endocrinology Division A/S [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Endocrinology Division A/S  
Ownership           100.00%  
Ascendis Pharma Bone Diseases A/S [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Bone Diseases A/S  
Ownership           100.00%  
Ascendis Pharma Growth Disorders A/S [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Growth Disorders A/S  
Ownership           100.00%  
Ascendis Pharma Oncology Division AS [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Oncology Division A/S  
Ownership           100.00%  
Ascendis Pharma Europe A/S [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Europe A/S  
Ownership           100.00%  
Ascendis Pharma UK Limited [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma UK Limited  
Ownership           100.00%  
Ascendis Pharma Iberia S.L. [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Iberia S.L.  
Ownership           100.00%  
Ascendis Pharma France SASU [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma France SASU  
Ownership           100.00%  
Ascendis Pharma Italia S.R.L. [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Italia S.R.L.  
Ownership           100.00%  
Ascendis Pharma Sverige AB [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Sverige AB  
Ownership           100.00%  
Ascendis Pharma Switzerland GmbH [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Switzerland GmbH  
Ownership           100.00%  
Ascendis Pharma Belgium BV [member]              
Disclosure of subsidiaries [line items]              
Company           Ascendis Pharma Belgium BV  
Ownership           100.00%  
ASND Portugal Unipessoal, Lda [member]              
Disclosure of subsidiaries [line items]              
Company           ASND Portugal, Unipessoal, Lda.  
Ownership           100.00%  
VISEN              
Disclosure of subsidiaries [line items]              
Company           VISEN Pharmaceuticals  
Ownership 39.20% 43.90%     50.00% 39.20% 43.90%
Eyconis Inc.              
Disclosure of subsidiaries [line items]              
Company           Eyconis Inc.  
Ownership     33.20% 41.60%   33.20%