Description of accounting policy for employee benefits [text block] Share-based Incentive Programs All levels of fair value hierarchy [member] Entity Address, City or Town Currently stated [member] Currently stated [member] Borrowings Current borrowings Subclassifications of assets, liabilities and equities [abstract] Separation of fair value Increase (decrease) through changes in fair values, liabilities arising from financing activities Weighted average exercise price of other equity instruments granted in share-based payment arrangement Granted during the year Weighted Average Exercise, Granted Interest paid Interest paid, classified as financing activities Payment of interest Disclosure detailed information about marketable securities. Disclosure Detailed Information About Marketable Securities [Text Block] Summary of Marketable securities Categories of related parties [axis] Categories of related parties [axis] Current tax liabilities Income tax payables Impairment loss recognised in profit or loss, intangible assets and goodwill Impairment loss recognised in profit or loss, intangible assets and goodwill Impairment charge Unobservable inputs [axis] Disclosure of fair value measurement of liabilities [abstract] Gross profit Gross profit Gross profit Borrowings threshold percentage of sale price per share for redemption. Borrowings Threshold Percentage Of Sale Price Per Share For Redemption Borrowings threshold percentage of sale price per share for redemption Carrying amount [member] Fair Value Hierarchy Carrying Amount [member] Fair value hierarchy carrying amount. Share of equity after eliminations. Share of equity after eliminations Company's share of equity after eliminations Realized duration of financial assets explanatory. Realized Duration of Financial Assets Explanatory Financial Assets Duration Period Revenue Revenue Total revenue Total revenue Business Contact [Member] Business Contact [member] Accumulated depreciation and amortisation [member] Accumulated depreciation [member] Licenses Licence fee income "Right-to-use" licenses Financial Assets and Financial Liabilities Disclosure of financial instruments [text block] Amendment Flag Collaboration Partner One. Collaboration partner one [Member] Purchase of available-for-sale financial assets Purchase of marketable securities Timing of transfer of goods or services [axis] Disclosure of employee compensation costs. Disclosure of employee compensation costs [line items] Disclosure of employee compensation costs [line items] Lease liabilities [member] Depreciation, right-of-use assets Depreciation Weighted average duration of marketable securities Weighted average duration of marketable securities explanatory. Weighted Average Duration Of Marketable Securities Explanatory Number of other equity instruments settled in share based payment arrangement. Number Of Other Equity Instruments Settled In Share Based Payment Arrangement Settled during the period Weighted average exercise price of other equity instruments vested in share-based payment arrangement Weighted average exercise price of other equity instruments vested in sharebased payment arrangement Vested at the reporting date Disclosure of income tax [text block] Tax on Profit/(Loss) for the Year and Deferred Tax Financial assets by category Categories of financial assets [abstract] Transferred during the period Number of other equity instruments transferred in share based payment arrangement. Number Of Other Equity Instruments Transferred In Share Based Payment Arrangement Transferred during the period Later than one year [member] Beginning balance (Holding in % of total outstanding shares) Ending balance (Holding in % of total outstanding shares) Treasury shares holding in percentage of total outstanding shares. Treasury Shares Holding In Percentage Of Total Outstanding Shares Non-cash consideration relating to revenue Adjustments for non cash consideration regarding revenue. Adjustments For Non Cash Consideration Regarding Revenue Disclosure of financial instruments by type of interest rate [abstract] Disclosure of associates [abstract] Retrospective application and retrospective restatement [axis] Retrospective application and retrospective restatement [axis] Disclosure Of Expenses Relating To Lease Activities In The Consolidated Statements. Disclosure of Expenses Relating To Lease Activities In The Consolidated Statements Summary of Expenses, Relating To Lease Activities In The Consolidated Statements Exchange rate losses (net) Net foreign exchange loss Profit loss for the year. Profit Loss For The Year Profit / (loss) for the year from continuing operations Applicable tax rate Applicable tax rate Disclosure of general information about financial statements [text block] General Information Classes of assets [axis] Classes of assets [axis] Deferred tax expense (income) [abstract] Country of incorporation of associate Domicile Categories of current financial assets [abstract] Line items by function [member] Tax Losses Carryforwards. Tax Losses Carryforwards Tax losses carryforwards Baker Bros. advisors LP. Baker Bros. Advisors LP [member] Baker Bros. advisors LP [member] Geographical areas [member] Geographical areas [member] Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] Items that may be reclassified subsequently to profit or loss: Total financial assets Financial assets at end of period Financial assets at beginning of period Financial assets Conversion price per share. Conversion Price Per Share Conversion price per share Goods or services transferred over time [member] Enforceable Lease Term Enforceable leaseterm. Enforceable LeaseTerm Classes of property, plant and equipment [axis] Classes of property, plant and equipment [axis] Disclosure of maturity analysis for derivative financial liabilities [table] Fair value loss, derivatives Losses on change in fair value of derivatives Losses on change in fair value of derivatives Description of accounting policy for loans and receivables [text block] Receivables Auditor Firm ID Investments in group enterprises. Investments In Group Enterprises [Abstract] Treasury shares reserve Reserve of Treasury Shares Reserve of treasury shares. LeaseTerm. Lease Term Lease Term Historical volatility for shares, measurement input [member] Disclosure of detailed information about employee cost. Disclosure Of Detailed Information About Employee Cost Explanatory [Text Block] Summary of Employee Cost Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement Exercised during the year Vested at the reporting date Entity Addresses, Address Type [Axis] Categories Of Shares Based Payments [Domain] Categories Of Shares Based Payments [Domain] Transaction price allocated to remaining performance obligations Contract liabilities are expected to be recognized as revenue Total property, plant and equipment Property, plant and equipment Property, plant and equipment at ending period Property, plant and equipment at beginning period Property, plant and equipment Profit or loss [abstract] Summary of Contractual Cashflows for Financial Liabilities Contractual Cashflows For Financial Liabilities [Text Block] Contractual cashflows for financial liabilities. Granted In 2012 to 2017 Member Granted In 2012 to 2017 [Member] Granted In 2012-2017 [member] Current liabilities Total current financial liabilities Current financial liabilities Disclosure of detailed information about borrowings [abstract] End of period Beginning of period Total borrowings Borrowings Lease commence period. Lease Commence Period Description of accounting policy for measuring inventories [text block] Inventories Summary of inventory disclosure . Summary of Inventory Disclosure [Table] Auditor's remuneration for other services All other fees Ascendis Pharma bone disease AS. Ascendis Pharma Bone Disease AS [member] Ascendis Pharma Bone Diseases A/S [member] Entities affiliated with RA capital management LLC. Entities Affiliated With RA Capital Management LLC [member] Entities affiliated with RA capital management LLC [member] High grade member. High Grade [Member] Interest rate types [member] Interest rate types [member] Disclosure of reconciliation of changes in intangible assets and goodwill [text block] Summary of Goodwill and Software Disclosure of terms and conditions of share-based payment arrangement [abstract] Non-current assets Non-current assets Total non-current assets Entity Incorporation, State or Country Code Disclosure of maturity analysis for derivative financial liabilities [abstract] Disclosure of financial instruments by type of interest rate [text block] Summary Of Rate Structure Of Marketable Securities Summary of Development in Borrowings Related to Financing Activities Disclosure of development in lease liabilities. Disclosure of development in lease liabilities [Text Block] Summary of Development In Lease Liabilities Auditor's remuneration for tax services Tax fees Vesting Vesting [Member] Disclosure of revenue from contracts with customers [text block] Contract liabilities Write-downs at reporting date Write-downs at reporting date Inventory write-down Two thousand and twenty three to two thousand and twenty six Two Thousand And Twenty Three To Two Thousand And Twenty Six [Member] T Rowe Price Associates Inc. T Rowe Price AssociatesInc [member] T Rowe Price Associates Inc [member] Share capital [member] Share capital [member] Ascendis Pharma Ophthalmology Division AS. Ascendis Pharma Ophthalmology Division AS [member] Ascendis Pharma Ophthalmology Division A/S [member] Project cost prepayments current. Project Cost Prepayments Current Project Cost Prepayments, Current Foreign currency risk. Foreign Currency Risk [axis] Foreign Currency Risk [axis] Convertible senior notes. Convertible Senior Notes Convertible senior notes Convertible Senior Notes Cash flows from (used in) operating activities [abstract] Operating activities Corporate bonds [Member]. Corporate bonds [Member] Corporate bonds [Member] Purchase of interests in associates Investment in associate Categories of financial liabilities [axis] Categories of financial liabilities [axis] Investments in associates reported in separate financial statements Investment in associate Total inventories, net Current inventories Inventories Goods or services transferred at point in time [member] Share of profit (loss) of associates accounted for using equity method Share of profit/(loss) of associate Share of profit/(loss) of associate Disclosure of non-adjusting events after reporting period [abstract] Transactions and outstanding balances. Transactions and outstanding balances [Abstract] Transactions and outstanding balances as of December 31 Financial Risk Management Entire disclosure of financial instruments and financial risk management. Disclosure Of Financial Instruments And Financial Risk Management [text block] Revenue from rendering of services Rendering of services Borrowings Threshold Trading Days For Redemption. Borrowings Threshold Trading Days For Redemption Borrowings threshold trading days for redemption Computer software [member] Computer software [member] Comprehensive income, attributable to owners of parent Attributable to owners of the Company Schedule of Financial Assets and Financial Liabilities Disclosure Of Financial Assets And Liabilities [text block] Disclosure Of Financial Assets And Liabilities [text block] Adjustments for decrease (increase) in prepaid expenses Prepayments Description of accounting policy for deferred revenues and contract liabilities. Description of accounting policy for deferred revenues and contract liabilities explanatory [text block] Contract Liabilities Adjustments for decrease (increase) in inventories Inventories Exchange rate gains (net) Net foreign exchange gain Net foreign exchange gain (loss) Foreign exchange gain (loss) Foreign exchange adjustment Share-based payment arrangement vesting period. Sharebased Payment Arrangement Vesting Period Vesting period US dollars to Euro. US dollars to Euro [member] US dollars to Euro [member] Transferred under stock incentive programs (Holding in 1% total outstanding shares) Treasury Shares Holding In Percentage Transferred under stock incentive programs Treasury shares holding in percentage transferred under stock incentive programs. Percentage of entity's revenue Percentage of entity's revenue Disclosure of terms and conditions of share-based payment arrangement [line items] Disclosure of terms and conditions of share-based payment arrangement [line items] Proceeds Increase Decrease Through Effect Of Proceeds, Liabilities Arising From Financing Activities Increase (decrease) through effect of proceeds, liabilities arising from financing activities. Description of accounting policy for finance income and costs [text block] Finance Income and Expenses Total borrowings Contractual undiscounted cashflow of borrowings Contractual undiscounted cashflow of borrowings. Weighted average duration of marketable securities noncurrent Weighted average duration of Marketable securities noncurrent explanatory. Weighted Average Duration Of Marketable Securities Noncurrent Explanatory Non-current financial assets available-for-sale Marketable securities Non-current financial marketable securities Later than three years and not later than five years [member] After 5 years [member] Disclosure of accounting judgements and estimates [text block] Significant Accounting Judgements and Estimates Total financial liabilities Non-derivative financial liabilities, undiscounted cash flows Number of other equity instruments vested in share-based payment arrangement. Number of other equity instruments vested in share-based payment arrangement Vested at the reporting date Weighted average number of ordinary shares used in calculating basic earnings per share Weighted average number of shares used for calculation (basic and diluted) Associates [member] Associates [member] Accretion of interest Increase Decrease Through Effect Of Accretion of Interest Liabilities Arising From Financing Activities The increase (decrease) in liabilities arising from financing activities resulting from the effect of accretion of interest. Wages and salaries Wages and salaries Acquired from third-parties (Holding) Increase decrease In treasury shares acquired from third parties. Increase Decrease In Treasury Shares Acquired From Third Parties Acquired from third-parties (Holding) Contract liabilities [Line Items]. Contract Liabilities [Line Items] VISEN VISEN pharmaceuticals. V I S E N Pharmaceutical [Member] VISEN Pharmaceuticals [member] City Area Code Description of accounting policy for impairment of assets [text block] Impairment Total current provisions Current provisions Provisions New IFRSs [axis] New IFRSs [axis] Germany [Member]. Germany [member] Germany [member] Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes Increase (decrease) in cash and cash equivalents before effect of exchange rate changes Increase/(decrease) in cash and cash equivalents Lease Extension Period. Lease Extension Period Optional Lease Extension Period Classes of employee benefits expense [abstract] Net profit/(loss) for the period Profit (loss) Loss for the year Net profit/(loss) for the year Total lease liabilities Lease liabilities End of period Beginning of period Lease liabilities Lease liabilities Document Period End Date Proceeds From Issuance Of Notes Proceeds from issue of bonds, notes and debentures Disclosure of detailed information about financial instruments [abstract] Nominal Value Amount Nominal Value Amount Nominal positions Disclosure Detailed Information About Marketable Securities LineItems. Disclosure Detailed Information About Marketable Securities [Line Items] Financial liabilities by category Categories of financial liabilities [abstract] Financial liabilities Exercise price of outstanding share options Exercise price Other temporary differences before valuation allowances. Other temporary differences before valuation allowances Other temporary differences Share-based payment arrangement, restricted stock unit, activity. Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Table] Profit (loss) [abstract] Statement of Profit or loss Disclosure of holding of treasury shares. Disclosure Of Holding Of Treasury Shares [Line Items] Disclosure of detailed information about intangible assets [line items] Disclosure of detailed information about intangible assets [line items] Adjustments for increase (decrease) in deferred income other than contract liabilities Contract liabilities (deferred income) Disclosure of associates [text block] Investment in Associate Disclosure of financial instruments by type of interest rate [table] Non-current liabilities Total non-current financial liabilities Non-current financial liabilities Entity's total for subsidiaries [member] Entity's total for subsidiaries [member] Current tax expense (income) and adjustments for current tax of prior periods [abstract] Tax on profit/(loss) for the year: DENMARK Denmark [member] Statement of comprehensive income [abstract] Total current prepayments Current prepayments Prepayments Disclosure of marketable securities specified by investment grade credit rating. Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Abstract] Par value per share Nominal value common shares Granted In 2019. Granted In 2019 [Member] Granted In 2019 [Member] Total current contract liabilities Current contract liabilities Contract liabilities Share-based payment arrangement, restricted stock unit, activity. Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items] Disclosure of detailed information about depreciations charges [Table] Net cash flows from (used in) financing activities Cash flows from (used in) financing activities Cash flows from/(used in) financing activities Line items represent concepts included in a table. These concepts are used to disclose reportable information about associate and joint ventures associated with domain members defined in one or many axes of the table. Disclosure of associates and joint ventures [line items] Disclosure of associates and joint ventures [line items] Acquisition of property, plant and equipment [member] Acquisition of Property, Plant and Equipment [Member] Acquisition of property, plant and equipment member. Description of accounting policy for cash flows [text block] Cash Flow Statement Disclosure of fair value measurement of liabilities [table] Entity Address, Postal Zip Code American depositary shares member. American Depositary Shares [Member] American Depositary Shares [member] Total trade and other payables Trade and other payables Trade payables Trade receivables from associate Trade receivables Document Fiscal Period Focus Geographical areas [axis] Geographical areas [axis] Adjustments to reconcile profit (loss) [abstract] Adjustments for non-cash items: Proceeds from sales of property, plant and equipment, classified as investing activities Proceeds from sales of property, plant and equipment Number of other equity instruments expired in share-based payment arrangement Expired during the year Adjustments for depreciation expense Depreciation Entities affiliated with FMR LLC. Entities Affiliated With FMR LLC [member] Entities affiliated with FMR LLC [member] Presentation of leases for lessee [abstract] Description of accounting policy for leases [text block] Leases Disclosure of quantitative information about right-of-use assets [table] Share-based payment reserve Reserve of share-based payments Contractual undiscounted cashflow of financial liabilities. Contractual Undiscounted Cashflow Of Financial Liabilities Total financial liabilities Two thousand and twenty two. Two Thousand And Twenty Two [Member] Entity File Number Securities Act File Number Principal place of business of associate Principal place of business Description of accounting policy for earnings per share [text block] Basic EPS Acquired from third-parties (Holding in % of total outstanding shares) Treasury Shares Holding In Percentage Of Total Outstanding Shares Acquired From Third-Parties. Treasury Shares Holding In Percentage Of Total Outstanding Shares Acquired From Third Parties Acquired from third-parties (Holding in 1% total outstanding shares) Disclosure of property, plant and equipment [text block] Property, Plant and Equipment Other financial expenses Other finance cost Liabilities arising from financing activities [member] Liabilities arising from financing activities [member] Description of accounting policy for recognition of revenue [text block] Revenue Executive board. Executive Board [member] Executive Board [member] Total average effective tax rate Average effective tax rate Effective tax rate Financial instruments, class [member] Current trade payables Trade payables and accrued expenses Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement Ending balance Beginning balance Weighted Average Exercise, Outstanding Disclosure of related party [text block] Related Party Transactions Classified in the statement of financial position Categories of non-current financial liabilities [abstract] Share premium [member] Share Premium [member] Commercial papers [Member]. Commercial papers [Member] Commercial papers [Member] Reconciliation of changes in fair value measurement, liabilities [abstract] Payments for development project expenditure Development expenditures (software) Disclosure of treasury shares [text block] Summary Of Holding Of Treasury Shares Auditor Location The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). Descriptions Of Risk Free Interest Rate Share Options Granted Risk-free interest rate Disclosure of interests in other entities [text block] Investments in Group Enterprises Ascendis Pharma endocrinology division AS. Ascendis Pharma Endocrinology Division AS [member] Ascendis Pharma Endocrinology Division A/S [member] Elimination of internal profit recognized. Elimination of Internal Profit Recognized Elimination of internal profit recognized Interest income Interest income Transfer under stock incentive programs Sale or issue of treasury shares Share-based payment arrangement, award type. Share based Payment Arrangement, Award type [Axis] Description of accounting policy for diluted earnings per share. Description of accounting policy for diluted earnings per share explanatory Diluted EPS Disposals, property, plant and equipment Disposals Disclosure of detailed information about property, plant and equipment [line items] Disclosure of detailed information about property, plant and equipment [line items] Warrants Granted From December 2021 [Member] Warrants Granted From December 2021 [Member] Warrants Granted From December 2021 [member] Net cash flows from (used in) investing activities Cash flows from (used in) investing activities Cash flows from/(used in) investing activities Disclosure of associate [Line Items] Disclosure of Associate [Line Items] Disclosure of associates [line items] Sharebased payment arrangement, restricted stock unit, activity. Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Text Block] Summary Of Share Based Payment Profit (loss), attributable to owners of parent Attributable to owners of the Company Other property, plant and equipment [member] Other equipment [member] Property, plant and equipment [abstract] Entities Affiliated With Artisan Partners Limited Partnership. Entities Affiliated With Artisan Partners Limited Partnership [Member] Entities affiliated with Artisan Partners Limited Partnership [member] Amortisation, intangible assets other than goodwill Amortisation, intangible assets other than goodwill Amortization Charge Disclosure of maturity analysis of operating lease payments [line items] Current tax assets, current Income tax receivables Statement of financial position [abstract] Statement of financial position North America 1 Member. North America1 [Member] North America [member] Reversal of gain loss on property plant and equipment. Reversal Of Gain Loss On Property Plant And Equipment Reversal of gain and loss on disposal of property, plant and equipment Borrowings in arrears default payment start date. Borrowings In Arrears Default Payment Start Date Borrowings in arrears default payment start date Antidilutive securities not included in diluted earnings per share. Antidilutive Securities Not Included In Diluted Earnings Per Share [Axis] Description of accounting policy for prepayments explanatory. Description of accounting policy for prepayments explanatory Prepayments Description of accounting policy for allowance for expected credit losses on financial assets. Description of Accounting Policy for Allowance for Expected Credit Losses on Financial Assets [text block] Allowance for Expected Credit Losses on Financial Assets Income statement [Axis]. Income Statement [Axis] Income Statement [Axis] Disclosure of detailed information about property, plant and equipment [text block] Summary of Property, Plant and Equipment Research and development costs. Research And Development Costs [Member] Research and development expenses [member] Research and development costs [member] Disclosure of reconciliation of changes in goodwill [table] Cash flows from (used in) financing activities [abstract] Financing activities Country of incorporation of subsidiary Domicile Statement of cash flows [abstract] Non-current liabilities Non-current liabilities Total non-current liabilities Level 1 [member] Level 1 of fair value hierarchy [member] Disclosure of maturity analysis for derivative financial liabilities [line items] Agency bonds [Member]. Agency bonds [Member] Agency bonds [Member] Financial liabilities measured at amortized cost Financial liabilities at amortised cost Financial liabilities measured at amortized cost Board of directors. Board Of Directors [member] Board of Directors [member] Total issued capital Issued capital Share capital Disclosure of detailed information about intangible assets [abstract] Non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets, and rights arising under insurance contracts Non-current segment assets Granted In 2022 [Member] Granted In 2022. Disclosure of finance income (cost) [text block] Schedule of Finance Income and Finance Expenses Disclosure of revenue [text block] Revenue Current Fiscal Year End Date Auditor's remuneration [abstract] Receivable from associate Receivables due from associates Total number of shares issued Number of shares issued Share capital end of year Share capital beginning of year Number of shares issued Disclosure of auditors' remuneration [text block] Principal Accountant Fees and Services Interest expense Interest expenses Disclosure of marketable securities specified by investment grade credit rating. Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Line Items] Other current receivables Other receivables Finance income expense [abstract]. Finance income expense [abstract] Revenue [abstract] Disclosure of Operating Segments [abstract] Purchase of treasury shares Acquisition of treasury shares Document Accounting Standard Disclosure of subsidiaries [abstract] Disposals, intangible assets and goodwill Disposals, intangible assets and goodwill Disposals Entity Address, Address Line One Description of consolidation principles explanatory. Description of consolidation principles explanatory Consolidation Principles Total financial liabilities Financial liabilities Total financial liabilities Derivative liabilities Non-current derivative financial liabilities Classified in the statement of financial position Categories of non-current financial assets [abstract] Document Annual Report Assets under construction [member] Construction in progress [member] Additional lease period in additon to Non cancellable period. Additional Lease Period In Additon To Non Cancellable Period Additional lease period in additon to Non cancellable period Disclosure of leases [text block] Leases Disclosure of inventories [text block] Inventories Disclosure Of Warrant Activity [line items] Disclosure Of Warrant Activity [line items] Disclosure Of Warrant Activity [line items] Board members of group. Board members of group [member] Attribution of expenses by nature to their function [axis] Warrants Granted 2012 Until November 2021 [Member] Warrants Granted 2012 Until November 2021 [Member] Warrants Granted 2012 Until November 2021 [member] Increase (decrease) through net exchange differences, intangible assets and goodwill Foreign exchange translation Major business combination [member] Major business combination [member] Percentage of reasonably possible increase in unobservable input, liabilities Key management personnel of entity or parent [member] Key management personnel of entity or parent [member] Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block] Summary of Fair Values for Warrant Grants Cash flows from (used in) investing activities [abstract] Investing activities Address Type [Domain] Disclosure of summary of significant accounting policies [table] Disclosure of summary of significant accounting policies [table] Disclosure of summary of significant accounting policies [table] Financial liabilities measured at fair value through profit or loss Total financial liabilities at fair value through profit or loss Financial liabilities at fair value through profit or loss Conversion rate per note. Conversion Rate Per Note Conversion rate per note Current liabilities Current liabilities Current liabilities Total current liabilities Current assets [abstract] Current assets Disclosure of basis of preparation of financial statements [text block] Basis of Preparation Currency [Axis] Name of associate Company Auditor Name Revenue from sale of clinical supply. Revenue From Sale Of Clinical Supply Sale of clinical supply Convertible senior notes. Contractual Undiscounted Cashflow Of Convertible Senior Notes Convertible senior notes Disclosure of General Information [Abstract] Disclosure of general information. Plant and machinery. Plant and machinery [member] Plant and machinery [member] Increase (decrease) through transactions with owners, equity Capital increase Disclosure of employee benefits [text block] Employee costs U.S. dollars [member] U.S. dollars [member] U.S. dollars [member] External credit grades [axis] External credit grades [axis] Related party transactions [abstract] Entity Filer Category Description of accounting policy for depreciation under property, plant and equipment. [Refer: Property, plant and equipment] Description of accounting policy for depreciation under property, plant and equipment explanatory Schedule of Asset's Expected Useful Life Description of accounting policy for expenses [text block] Selling, General and Administrative Expenses Financial assets at amortised cost Financial assets measured at amortized cost Non-adjusting events after reporting period [member] Non-adjusting events after reporting period [member] Process plant and machinery [member] Process plant and machinery [member] Process plant and machinery [member] Additions Increase (decrease) through financing cash flows, liabilities arising from financing activities Entity Current Reporting Status Year of grant of warrants. Year of grant of warrants Year of grant Additions other than through business combinations, intangible assets other than goodwill Additions American depository shares. American depository shares [member] Swiss franc to Euro [member] Swiss Franc to Euro [Member] Swiss franc to euro member. Disclosure of significant accounting policies [text block] Summary of Significant Accounting Policies Finance income. Finance Income [Abstract] Finance income Description of accounting policy for other payables explanatory. Description Of Accounting Policy For Other Payables Explanatory [Text Block] Other Liabilities ICFR Auditor Attestation Flag Reserve of exchange differences on translation [member] Foreign Currency Translation Reserve [member] Selling General And Administrative Expense [Member] Selling, general and administrative expenses [member] Granted in 2018 [member] Granted in 2018 [member] Granted in 2018 [member] Acquired from third-parties (Nominal values) Purchase of treasury shares nominal value. Purchase Of Treasury Shares Nominal Value Acquired from third-parties (Nominal value) Description of accounting policy for property, plant and equipment [text block] Property, Plant and Equipment Minimum Number of Collaboration Partner. Minimum number of collaboration partner [Axis] Convertible Senior Notes and Embedded Derivative Liabilities Description Of Accounting Policy For Convertible Notes And Embedded Derivative Liabilities [Policy Text Block] Description of accounting policy for convertible notes and embedded derivative liabilities. Disclosure of detailed information for principal accountant fees and service explanatory. Disclosure of Detailed Information For Principal Accountant Fees and Service Explanatory [Text Block] Summary of Principal Accountant Fees and Services December two thousand and twenty three. December Two Thousand And Twenty Three [Member] December 2023 [Member] Disclosure of detailed information about depreciations charges. Disclosure of detailed information about depreciations charges Summary of Depreciation Charges Hedging instruments [axis] Disclosure of classes of share capital [text block] Summary of Number of Shares Disclosure detailed information about marketable securities table. Disclosure Detailed Information About Marketable Securities [Table] Text block [abstract] UnableToMigrateMatchesIfrsTextblock[abstract] Text block [abstract] Disclosure of detailed information about borrowings [table] Trade payables and accrued expenses Trade payables Major components of tax expense (income) [abstract] Borrowings Total non-current portion of non-current borrowings Non-current portion of non-current borrowings Description of accounting policy for intangible assets other than goodwill [text block] Software Level 2 [member] Level 2 of fair value hierarchy [member] Total post-employment benefit expense in profit or loss, defined benefit plans Post-employment benefit expense in profit or loss, defined benefit plans Pensions (defined contribution plans) Weighted average duration of marketable securities current Weighted average duration of marketable securities current. Weighted Average Duration Of Marketable Securities Current Explanatory Disclosure of foreign currency sensitivity analysis explanatory [text block] Disclosure of foreign currency sensitivity analysis explanatory [text block] Summary of Foreign Currency Sensitivity Analysis Financial liabilities at amortised cost, class [member] Financial liabilities at amortised cost, class [member] Proceeds from issuing shares Net proceeds from follow-on public offerings End of period Beginning of period Liabilities arising from financing activities Depreciation, property, plant and equipment Depreciations charges Depreciation charge Level 3 [member] Level 3 of fair value hierarchy [member] Entity Emerging Growth Company Disclosure of reconciliation of liabilities arising from financing activities [line items] Financial assets, category [member] Financial assets, category [member] Tax effect of deductible items not expensed. Tax effect of deductible items not expensed Additional tax deductions Adjustments for provisions Increase/(decrease) in provisions Categories of financial assets [axis] Categories of financial assets [axis] Components of equity [axis] Components of equity [axis] Antidilutive securities not Included In diluted earnings per share. Antidilutive Securities Not Included In Diluted Earnings Per Share [Member] Adjustments for amortisation expense Amortization Disclosure of number and weighted average exercise prices of other equity instruments [text block] Summary of Weighted Average Exercise Prices and Movements in Warrants Borrowings, maturity Dilutive effect of convertible instruments on number of ordinary shares Warrants outstanding Average number of employees Average number of employees Payments to acquire or redeem entity's shares Acquisitions of treasury shares, net of transaction costs Reimbursement from acquisition of property, plant and equipment. Reimbursement From Acquisition of Property Plant and Equipment Reimbursement from acquisition of property, plant and equipment Disclosure Of Sharebased Payment Arrangements [Abstract] Disclosure of sharebased payment arrangements. Europe [member] Europe [Member] Description of accounting policy for determining components of cash and cash equivalents [text block] Cash and Cash Equivalents Contractual capital commitments Contractual commitments Entity Voluntary Filers Number of additional shares granted. Number Of Additional Shares Granted Number of additional shares granted Disclosure of commitments and contingencies [line items] Disclosure of commitments and contingencies [line items] Disclosure of detailed information about property, plant and equipment [abstract] Disclosure of changes in accounting estimates [abstract] Document Transition Report Right-of-use assets [member] Right-of-use assets [member] Right-of-use assets [member] Profit (loss) from operating activities Operating profit/(loss) Functional Currency [Domain] Functional Currency [Domain] Functional Currency [Domain] Net cash flows from (used in) operating activities Cash flows from (used in) operating activities Cash flows from/(used in) operating activities Tax Effect From Deferred Tax Asset, Not Recognized. Tax Effect From Deferred Tax Asset Not Recognized Deferred tax asset, not recognized Contract liabilities [abstract] Current financial assets available-for-sale Current financial marketable securities Marketable securities Vesting Of Shares [Axis] Vesting of shares. Entity Common Stock, Shares Outstanding Zero Coupon [Member] Zero Coupon [Member]. Zero Coupon [Member] Share repurchase program, Number of shares authorized to be repurchased. Share Repurchase Program Number Of Shares Authorized To Be Repurchased Share repurchase program, Number of shares authorized to be repurchased Equity [abstract] Equity Disclosure of changes in accounting estimates [line items] Disclosure of changes in accounting estimates [line items] Assets at end of period Assets at beginning of period Assets Total assets Disclosure of temporary difference, unused tax losses and unused tax credits [text block] Summary of Tax on Profit/Loss and Deferred Tax Income taxes refund (paid) Income taxes paid (refund), classified as operating activities Income taxes received/(paid) Statement of changes in equity [abstract] Entity's total for associates [member] Entity's total for associates [member] Revenue (geographical) Disclosure of geographical areas [abstract] Disclosure of financial instruments by type of interest rate [line items] Timing of transfer of goods or services [member] Denmark, Kroner Danish Kroner (DKK) [member] Document Information [Line Items] Outstanding convertible notes, coupon fixed rate Borrowings, interest rate Borrowings, interest rate U.S. Government Bonds [Member]. US Government Bonds [Member] US Government Bonds [Member] Entity Registrant Name Classes of other provisions [axis] Schedule Of Marketable Securities Specified By Investment Grade Credit Rating Disclosure of information about marketable securities specified by investment grade credit rating explanatory. Disclosure Of Information About Marketable Securities Specified By Investment Grade Credit Rating Explanatory [Table Text Block] Disclosure of changes in accounting estimates [table] Disclosure of changes in accounting estimates [table] Total comprehensive income Comprehensive income Total comprehensive income/(loss) Effect of exchange rate changes on cash and cash equivalents Effect of exchange rate changes on balances held in foreign currencies Deferred tax asset, not recognized. Deferred tax asset not recognized Deferred tax asset, not recognized Transferred under stock incentive programs (Nominal Value) Treasury Shares Transferred Under Stock Incentive Program Nominal Value Treasury shares transferred under stock incentive program nominal value. Disclosure of summary of significant accounting policies [abstract] Disclosure of summary of significant accounting policies [abstract] Total employee costs Employee benefits expense Employee benefits expense Key management personnel compensation Disclosure of operating segments [abstract] Financial assets, class [member] Financial assets, class [member] Title of 12(b) Security Employees and consultants. Employees and Consultants [Member] Employees and consultants [member] Condensed Income Statement [Table] Statement of comprehensive income, profit or loss location 1. Statement of comprehensive income, profit or loss location [member] Statement of comprehensive income, profit or loss location [member] Net cash flows from (used in) operations Cash flows from (used in) operations Cash flows generated from/(used in) operations Events after reporting period. Events After Reporting Period [Member] Disclosure Of Beneficial Ownership [line items] Disclosure Of Beneficial Ownership [line items] Disclosure of beneficial ownership [line items] Number of other equity instruments outstanding in share-based payment arrangement Ending balance Beginning balance Number of Warrants, Outstanding Disclosure of share-based payment arrangements [text block] Share-based Payment Borrowings condition for redemption. Borrowings Condition For Redemption Borrowings condition for redemption Disclosure Of Beneficial Ownership [abstract] Disclosure Of Beneficial Ownership [abstract] Property, plant and equipment [member] Property, plant and equipment [member] Document Type Disclosure of intangible assets [text block] Intangible Assets Research and development expense Research and development costs Entity's total for related parties [member] Entity's total for related parties [member] Disclosure of quantitative Information about inventories explanatory. Disclosure of Quantitative Information about Inventories Explanatory [Table Text Block] Summary of Inventories Explanatory UNITED STATES USA [member] Disclosure of reconciliation of liabilities arising from financing activities [table] Subsidiaries [axis] Subsidiaries [axis] Accounting profit Profit/(loss) before tax Entity Shell Company Social security contributions Social security costs Classes of intangible assets and goodwill [axis] Total income taxes paid (refund) Income taxes paid (refund) Income taxes refund Profit loss before income tax. Profit loss before income tax [abstract] Tax for the year can be explained as follows: Summary of Significant Accounting Policies [abstract] Summary of significant accounting policies. Short term leases and leases of low value assets Expense relating to short-term leases for which recognition exemption has been used Other current liabilities Other liabilities Share of equity before eliminations. Share of equity before eliminations Company's share of equity before eliminations Granted in 2012 to 2018 [Member] Granted in 2012 to 2018. Adjustments for decrease (increase) in trade and other receivables Receivables Project Cost accruals current. Project Cost Accruals Current Project Cost Accruals, Current Share price applied for valuation. Share Price Applied For Valuation Share price Nominal amount of treasury shares Ending balance (Nominal Value) Beginning balance (Nominal value) Treasury shares Treasury shares Bottom of range [member] Bottom of range [member] Summary of Development in Borrowings Related to Financing Activities Disclosure of reconciliation of liabilities arising from financing activities [text block] North America [Member] North America [member] Number of employees1. Number of employees1 Number of persons Additional office facility. Additional Office Facility [Member] Lease expenses. Lease Expenses Total lease expenses Marketable securities explanatory. Marketable Securities Explanatory Marketable Securities Security Exchange Name Lease liabilities [abstract] Increase through cash contributions Increase (decrease) through cash contribution. Increase (decrease) through cash contribution Current assets Total current financial assets Current financial assets Gains (losses) on change in value of foreign currency basis spreads, before tax Equity before tax Profit and loss before tax Disclosure Of Beneficial Ownership [table] Disclosure Of Beneficial Ownership [table] Disclosure Of Beneficial Ownership [table] Liquidity risk [member] Liquidity risk [member] Disclosure of events after reporting period [text block] Subsequent Events Liabilities [member] Financial assets at fair value, class [member] Financial assets at fair value, class [member] Document Registration Statement Increase (decrease) through net exchange differences, property, plant and equipment Foreign exchange translation Useful life measured as period of time, property, plant and equipment Asset's expected useful life Associates [axis] Associates [axis] Classes of financial assets [axis] Classes of financial assets [axis] Ending balance Beginning balance Derivative liabilities Derivative financial liabilities Not later than one year [member] Within 1 year [member] Description of accounting policy for trade and other payables [text block] Trade Payables and Accrued Expenses Convertible senior notes [Member] Convertible senior notes [Member]. Convertible Senior Notes [Member] December two thousand and twenty two. December Two Thousand And Twenty Two [Member] December 2022 [Member] Entity Address, Country Contact Personnel Name Coupon fixed rate structure [member] Fixed interest rate [member] Fixed interest rate [Member] Cost of sales [member] British pounds to Euro. British pounds to Euro [member] British pounds to Euro [member] Disclosure of detailed information about financial instruments [table] Disclosure of detailed information about financial instruments [table] Number of reportable operating segments. Number of reportable operating segments Number of reportable segment Total current tax expense (income) and adjustments for current tax of prior periods Current tax expense (income) and adjustments for current tax of prior periods Current tax expense (income) and adjustments for current tax of prior periods Expected volatility, share options granted Expected volatility Disclosure of quantitative information about right-of-use assets [abstract] Classes of financial instruments [axis] Description of accounting policy for research and development expense [text block] Research and Development Costs Minimum [Member] Minimum [Member] Income statement. Income Statement [Domain] Income Statement [Domain] CHINA China [member] Ascendis Pharma Endocrinology GmbH [member] Ascendis Pharma Endocrinology GmbH [Member] Ascendis Pharma Endocrinology GmbH. Share-based payment arrangement, award type. Sharebased Payment Arrangement, Award type [Domain] Remeasurement recognized in financial income or expense Derivative Financial Liabilities at Fair Value Remeasurement Recognized in Financial Income Or Expense Derivative financial liabilities at fair value remeasurement recognized in financial income or expense. Description of accounting policy for stockholders equity. Description of accounting policy for stockholders equity [txt block] Shareholders' Equity Assets [abstract] Assets Total intangible assets and goodwill Intangible assets and goodwill Intangible assets at ending period Intangible assets at beginning period Maturity [axis] Granted Number of other equity instruments granted in share-based payment arrangement Number of Warrants, Granted Disclosure of voluntary change in accounting policy [abstract] Associate [abstract] Associate [abstract] VISEN Pharmaceuticals Principal amount Notional amount Goodwill and other intangible assets. Goodwill And Other Intangible Assets Intangible assets Ordinary shares [member] Ordinary shares [member] Net deferred tax assets Total Deferred Tax Assets at December 31 Reserve of share-based payments [member] Share-based Payment Reserve [member] Proportion of ownership interest in subsidiary Ownership Description of basis of consolidation. Description Of Basis Of Consolidation [text block] Basis of Consolidation Description of accounting policy for provisions [text block] Provisions Ascendis Pharma, Inc.. Ascendis Pharma, Inc. [member] Ascendis Pharma, Inc [member] Disclosure of subsidiaries [table] Disclosure of subsidiaries [table] Types of risks [axis] Types of risks [axis] Carrying amount [member] Carrying amount [member] Revenue from sale of goods Commercial sale of products Number of licenses. Number of licenses Number of licenses classified as right to use Current work in progress Work in progress Finance income Finance income Total finance income Reversal of finance income The disclosure of number and weighted average remaining contractual life of outstanding other equity instruments. Disclosure of number and weighted average remaining contractual life of outstanding other equity instruments [text block] Schedule of Weighted Average Exercise Price and Weighted Remaining Contractual Life for Outstanding Warrants Other receivables Other receivables Entity Central Index Key Share price measurement input [member]. Share Price Measurement Input [Member] Lower medium grade. Lower Medium Grade [Member] Disclosure of employee compensation cost. Disclosure of employee compensation costs [table] Disclosure of employee compensation costs [table] Construction expenditure incurred but not paid. Construction Expenditure Incurred But Not Paid Construction expenditure incurred but not paid Country of domicile [member] Denmark [member] Gross carrying amount [member] Gross carrying amount [member] Disclosure of quantitative information about right-of-use assets [line items] Disclosure of classes of share capital [abstract] Disclosure of subsidiaries [text block] Summary of Investments in Group Enterprises Additions other than through business combinations, property, plant and equipment Additions Current trade receivables Trade receivables Construction in progress Assets under construction amounts Financial Risk Management Disclosure of financial risk management [text block] Upper medium grade. Upper Medium Grade [Member] Classification Of Related Party [Domain] Classification Of Related Party [Domain] Weighted average exercise price of other equity instruments expired in share-based payment arrangement Expired during the year Disclosure of detailed information about property, plant and equipment [table] Disclosure of detailed information about property, plant and equipment [table] Ascendis Pharma GmbH. Ascendis Pharma GmbH [member] Ascendis Pharma GmbH [member] Other provisions [member] Proportion of voting rights held in associate Percentage of warrants vested. Percentage Of Warrants Vested Percentage of warrants vested Transferred Increase (decrease) through transfers, property, plant and equipment Summary of Fair Value Hierarchy Disclosure of Summary of Fair Value Hierarchy [Table Text Block] Disclosure of summary of fair value hierarchy. Warrants. Warrant1 [member] Warrants [member] Non current assets finance liabilities abstract. Non Current Assets Finance Liabilities [abstract] Disclosure of holding of treasury shares. Disclosure Of Holding Of Treasury Shares [Table] Proceeds from disposal or maturity of available-for-sale financial assets Settlement of marketable securities Total contract liabilities Contract liabilities at end of period Contract liabilities at beginning of period Contract liabilities Document Information [Table] Name of subsidiary Company Contractual undiscounted cashflow of trade payables and other payables. Contractual Undiscounted Cashflow Of Trade Payables And Other Payables Trade payables Current tax expense (income) Current tax (expense)/income Investments accounted for using equity method [abstract] Disclosure of detailed information about depreciations charges [Line Items] Transferred under stock incentive programs (Holding) Increase Decrease In Treasury Shares Transferred Under Stock Incentive Program Increase decrease in treasury shares transferred under stock incentive program. Option life, share options granted Expected life of warrants (years) Collaboration Partners and License Agreements. Collaboration partners and license agreements [Member] Collaboration partners and license agreements [Member] Prime [Member] Prime1 [Member] Prime1. Disclosure of fair value measurement of liabilities [line items] Ascendis Pharma Endocrinology Inc [Member] Ascendis Pharma Endocrinology, Inc. [member] Finance costs Finance costs Reversal of finance expenses Total finance expenses Finance expenses Weighted average remaining life for outstanding warrants Weighted average remaining contractual life of outstanding other equity instruments Weighted average remaining contractual life of outstanding other equity instruments Weighted Average Life, Granted Sales rebates and product returns [member] Sales rebates and product returns. Financial assets available-for-sale Financial marketable securities Expected Lease Commence Year Expected lease commence year. Expected Lease Commence Year Borrowings threshold consecutive trading days for redemption. Borrowings Threshold Consecutive Trading Days For Redemption Borrowings threshold consecutive trading days for redemption Disclosure of initial application of standards or interpretations [text block] New International Financial Reporting Standards Not Yet Effective Condensed Income Statements, Captions [Line Items] Entity Interactive Data Current December two thousand and twenty four. December Two Thousand And Twenty Four [Member] December 2024 [Member] Granted In 2021 [Member] Granted In 2021 [Member] Granted In 2021 [Member] Retained earnings [member] Accumulated Deficit [member] Non-current assets [abstract] Non-current assets Provisions Total other provisions Other provisions Other provisions at end of period Other provisions at beginning of period Restricted stock units. Restricted Stock Units [Member] Line items representing the disclosure of summary of significant accounting policies. Disclosure Of Summary Of Significant Accounting Policies [line items] Disclosure of summary of significant accounting policies [line items] Disclosure of operating segments [text block] Disclosure of intangible assets, and property, plant and equipment Non-executive Senior Management. Nonexecutivesenior management [Member] Granted In 2020. Granted In 2020 [Member] Granted In 2020 [Member] Increase (decrease) through share-based payment transactions, equity Share-based payment (Note 7) Local Phone Number Capital commitments [abstract] Revenue recognized from contract liabilities. RevenueRecognizedFromContractLiabilities Revenue recognized from contract liabilities Ascendis Pharma growth disorders AS. Ascendis Pharma Growth Disorders AS [member] Ascendis Pharma Growth Disorders A/S [member] Short-term investments, classified as cash equivalents Short-term marketable securities Number of other equity instruments exercised or vested in share-based payment arrangement Vested at the reporting date Exercised during the year Weighted average exercise price of other equity instruments forfeited in share-based payment arrangement Forfeited during the year Interest rate risk [member] Interest rate risk [member] Ranges [member] Ranges [member] Payments of lease liabilities Payments of lease liabilities, classified as financing activities Payment of principal portion of lease liabilities Foreign currency risk domain. Foreign Currency Risk [domain] Foreign Currency Risk [domain] Classification Of Related Party [Axis] Classification Of Related Party [Axis] Disclosure of commitments and contingent liabilities [text block] Commitments and Contingencies Disclosure of employees compensation costs. Disclosure of employee compensation costs [abstract] Office facility. Office Facility [Member] Unobservable inputs [member] Document Shell Company Report Deferred revenue from associate. Deferred Revenue From Associate Deferred revenue from associate Liabilities arising from financing activities [axis] Liabilities arising from financing activities [axis] Types of share-based payment arrangements [axis] Types of share-based payment arrangements [axis] All Currencies [Domain] Range [axis] Range [axis] Intangible assets and goodwill [member] Potential conversion of convertible senior notes into number of ordinary shares. Potential Conversion Of Convertible Senior Notes Into Number Of Ordinary Shares Convertible notes Finance costs paid, classified as operating activities Finance expenses paid Disclosure Of Commitments And Contingencies [table] Disclosure Of Commitments And Contingencies [table] Document Fiscal Year Focus Later than one year and not later than five years [member] Within 1 to 5 years [member] Types of interest rates [axis] Types of interest rates [axis] Finance expenses. Finance Expenses [Abstract] Finance expenses Minimum beneficial ownership percentage. Minimum Beneficial Ownership Percentage Minimum beneficial ownership percentage Leasehold improvements [member] Leasehold improvements [member] The entire disclosure of beneficial ownership explanatory. Disclosure Of Beneficial Ownership [text block] Ownership Fair value [member] At fair value [member] Hedging instruments [member] Disclosure of marketable securities specified by investment grade credit rating. Disclosure Of Marketable Securities Specified By Investment Grade Credit Rating [Table] Foreign Currency Target Percentage Foreign Currency Target Percentage Foreign currency target percentage Financial liabilities [member] Financial liabilities, class [member] Disclosure of entity's operating segments [text block] Segment Information Total cash and cash equivalents Cash and cash equivalents Cash and cash equivalents at December 31 Cash and cash equivalents at January 1 Cash and cash equivalents Aggregated measurement [member] Beginning balance (Holding) Ending balance (Holding) Number of treasury shares outstanding. Number Of Treasury Shares Outstanding Short-term deposits, classified as cash equivalents Bank deposits Additional tax deduction. Additional Tax Deduction Additional tax deductions, determined by annual warrants exercises by employees Classes of liabilities [axis] Distributable equity. Distributable equity Distributable equity Additions Increase decrease in derivative financial liabilities fair value. Increase Decrease In Derivative Financial Liabilities Fair Value Increase decrease in derivative financial liabilities fair value Number of other equity instruments forfeited in share-based payment arrangement Forfeited during the year Tax effect of tax losses Tax deductible losses Basic And Diluted Earnings Loss Per Shares Basic And Diluted Earnings Loss Per Shares Basic and diluted earnings/(loss) per share Major persons or groups of affiliated persons holding minimum beneficial ownership. Major persons or groups of affiliated persons holding minimum beneficial ownership Minimum beneficial ownership Risks [member] Risks [member] Tax effect of expense not deductible in determining taxable profit (tax loss) Non-deductible costs Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Entities affiliated with Janus Henderson Group plc. Entities Affiliated With Janus Henderson Group plc [Member] Entities affiliated with Janus Henderson Group plc [member] Issued Capital [member] Issued capital [member] Issued Capital [member] Levels of fair value hierarchy [axis] Disclosure of associates [line items] Floating interest rate [member] Fair Value Of Warrants Granted Fair Value Of Warrants Granted Fair value of warrants granted in the year Accumulated impairment [member] Accumulated impairment [member] Classes of share capital [axis] Classes of share capital [axis] Other comprehensive income that will be reclassified to profit or loss, net of tax Other comprehensive income/(loss) for the year, net of tax Other comprehensive income/(loss), net of tax Utilization of write-downs Utilisation of Inventory write-downs Utilisation of inventory write-downs. Derivatives [member] Classes of financial liabilities [axis] Description of accounting policy for intangible assets and goodwill [text block] Intangible assets Warrant compensation cost. Warrant Compensation Cost Warrant compensation cost Non-current liabilities [abstract] Non-current liabilities Top of range [member] Top of range [member] Foreign Currency Conversion Option. Foreign Currency Conversion Option [Member] Lease interest Accretion of interest Reconciliation of accounting profit multiplied by applicable tax rates [abstract] Tax effect of: Statement of changes in equity [table] Fair Value of Other Equity Instruments Granted Weighted average fair value at measurement date, other equity instruments granted Increase in foreign currency exchange rate Increase decrease in foreign currency exchange rate. Increase Decrease In Foreign Currency Exchange Rate Disclosure of holding of treasury shares. Disclosure Of Holding Of Treasury Shares [Abstract] Cover [Abstract] New IFRSs [member] New IFRSs [member] Weighted average share price Weighted average share price Right to use. Right to Use [Member] Right to use [member] Movements in Level 3 Fair Value Measurements Disclosure of Movements in Level Three Fair Value Measurements [Table Text Block] Disclosure of movements in level 3 fair value measurements. Assets [member] Assets [member] Disclosure of segment revenues by destination of major customers explanatory. Disclosure of segment revenues by destination of major customers explanatory Schedule of Revenue Recognized in Consolidated Statement of Profit or Loss Entities Affiliated With Wellington Management Group LLP. Entities Affiliated With Wellington Management Group LLP [Member] Entities affiliated with Wellington Management Group LLP [Member] Inventories. Inventories [Abstract] Measurement [axis] Proceeds from exercise of warrants Proceeds from exercise of warrants Other comprehensive income, net of tax, exchange differences on translation of foreign operations Other comprehensive income, net of tax, exchange differences on translation of foreign operations Exchange differences on translating foreign operations Current finished goods Finished goods Contract liabilities [Table]. Contract Liabilities [Table] Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [axis] Current assets Current assets Total current assets Total current raw materials and current production supplies Current raw materials and current production supplies Raw materials and consumables Maximum [Member] Maximum [Member] Total liabilities Liabilities at end of period Liabilities Liabilities at beginning of period Liabilities Total liabilities Additions To Lease Liabilities. Additions To Lease Liabilities Additions Disclosure of going concern [text block] Going Concern Current liabilities [abstract] Current liabilities Goodwill [member] Goodwill [member] Disclosure of reconciliation of liabilities arising from financing activities [abstract] Repayments Increase Decrease Through Effect Of Repayments, Liabilities Arising From Financing Activities Increase (decrease) through effect of repayments, liabilities arising from financing activities. Proportion of ownership interest in associate Ownership Percentage of ownership in the customer company Reversal of write-downs Reversal of inventory write-down Reversal of inventory write-down Description of accounting policy for income tax [text block] Income Taxes Disclosure of associates [table] Disclosure of associates [table] Entity's total for external credit grades [member] Entity's total for external credit grades [member] Equity [member] Equity [member] Borrowings redemption period. Borrowings Redemption Period Borrowings redemption period Disclosure of subsidiaries [line items] Disclosure of subsidiaries [line items] Changes in working capital. Changes in working capital [abstract] Changes in working capital: Contractual undiscounted cashflow of Financial lease liabilities. Contractual Undiscounted Cashflow Of Financial Lease Liabilities Lease liabilities Other non-current receivables Other receivables Ascendis Pharma On cology Division AS Member Ascendis Pharma Oncology Division AS [Member] Ascendis Pharma Oncology Division AS [member] Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement Weighted average exercise price Statement [LineItems] Statement of changes in equity [line items] Equity and liabilities Total equity and liabilities Adjustments for share-based payments Share-based payment Disclosure of terms and conditions of share-based payment arrangement [table] Disclosure of terms and conditions of share-based payment arrangement [table] Disclosure of detailed information about intangible assets [table] Disclosure of detailed information about intangible assets [table] Total inventories, gross Inventories Consideration paid (received) Consideration received Auditor's remuneration Total principal accountant fees and services Credit risk [member] Tax effects from impacts from associates. Tax Effects From Impacts From Associates Impact from associate Treasury shares [member] Summary of inventory disclosure. Summary of Inventory Disclosure [Line Items] Share-based payment arrangements [member] Share-based payment arrangements [member] Description of accounting policy for foreign currency translation [text block] Foreign Currency Total selling, general and administrative expense Selling, general and administrative expense Selling, general and administrative expenses Aggregated time bands [member] Cost of sales Cost of sales Cost of sales Description Of Accounting Policy For Changes In Accounting Policies and Disclosures [policy text block] Description Of Accounting Policy For Changes In Accounting Policies and Disclosures [policy text block] Changes in Accounting Policies and Disclosures No Trading Symbol Flag No Trading Symbol Flag Other tax effects for reconciliation between accounting profit and tax expense (income) Other effects including effect of different tax rates Costs of capital increase (decrease). Costs of capital increase (decrease) Cost of capital increase Invoicing of goods and services to associate Sale of goods and services to associate. Sale of goods and services to associate Statement of comprehensive income, profit or loss location. Statement of comprehensive income, profit or loss location [axis] Statement of comprehensive income, profit or loss location [axis] Trading Symbol Adjustments for increase (decrease) in trade and other payables Trade payables, accrued expenses and other payables Equity and liabilities [abstract] Equity and liabilities Disclosure of detailed information about financial instruments [line items] Disclosure of detailed information about financial instruments [line items] Purchase of property, plant and equipment Purchase of property, plant and equipment, classified as investing activities Acquisition of property, plant and equipment Disclosure of operating segments [table] Disclosure of operating segments [table] Other equipment Member Other equipment [Member] Other equipment [member] U.S. Treasury bills [Member]. US Treasury bills [Member] US Treasury bills [Member] Description of accounting policy for available-for-sale financial assets [text block] Marketable Securities Total tax expense (income) Tax income (expense) Tax expense (income) Reversal of tax charge Tax on profit/(loss) for the year Tax on profit/(loss) for the year Customers [member] Customers [member] Expense from share-based payment transactions with employees Share-based payment Schedule of Financial Information of Investment in VISEN Disclosure of investments accounted for using equity method [text block] Functional Currency [Axis] Functional Currency [Axis] Functional Currency [Axis] Entity Well-known Seasoned Issuer Financial liabilities, category [member] Financial liabilities, category [member] Net proceeds from convertible senior notes. Net Proceeds From Convertible Senior Notes Net proceeds from convertible senior notes Non-current assets Total non-current financial assets Non-current financial assets Finance income received, classified as operating activities Finance income received Total non-current contract liabilities Non-current contract liabilities Contract liabilities Equity Equity Equity Equity Total equity Auditor's remuneration for audit services Audit fees Commercial Customers. Commercial customers [Member] Major customers [axis] Major customers [axis] Total lease cash-outflows Cash outflow for leases Payment of principal portion of liabilities Financial liabilities at fair value, class [member] Categories Of Shares Based Payments [Axis] Categories Of Shares Based Payments [Axis] Foreign exchange adjustment Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities Profit (loss) before tax Profit/(loss) before tax Tax expense (income) at applicable tax rate Tax at the Danish corporation tax rate of 22% Revenue Disclosure of operating segments [line items] Disclosure of operating segments [line items] Financial assets at amortised cost, class [member] Financial assets at amortised cost, class [member]