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Document and Entity Information	6 Months Ended
Document and Entity Information	Jun. 30, 2018
Document - Document and Entity Information [Abstract]
Document Type	6-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Trading Symbol	ASND
Entity Registrant Name	Ascendis Pharma A/S
Entity Central Index Key	0001612042
Current Fiscal Year End Date	--12-31

Condensed Consolidated Interim Statements of Profit or Loss and Other Comprehensive Income / (Loss) - EUR (€)
€ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

Profit or loss [abstract]

Revenue

€ 18

€ 444

€ 46

€ 816

Research and development costs

(40,235)

(21,880)

(70,775)

(42,488)

General and administrative expenses

(5,226)

(3,231)

(9,888)

(6,556)

Operating profit / (loss)

(45,443)

(24,667)

(80,617)

(48,228)

Finance income

22,573

158

16,270

288

Finance expenses

(6)

(6,234)

(11)

(7,956)

Profit / (loss) before tax

(22,876)

(30,743)

(64,358)

(55,896)

Tax on profit / (loss) for the period

206

Net profit / (loss) for the period

(22,777)

(30,706)

(64,152)

(55,845)

Items that may be reclassified subsequently to profit or loss:

Exchange differences on translating foreign operations

(7)

Other comprehensive income / (loss) for the period, net of tax

(7)

Total comprehensive income / (loss)

(22,775)

(30,664)

(64,159)

(55,799)

Profit / (loss) for the period attributable to owners of the Company

(22,777)

(30,706)

(64,152)

(55,845)

Total comprehensive income / (loss) for the period attributable to owners of the Company

€ (22,775)

€ (30,664)

€ (64,159)

€ (55,799)

Basic earnings / (loss) per share

€ (0.55)

€ (0.94)

€ (1.60)

€ (1.72)

Diluted earnings / (loss) per share

€ (0.55)

€ (0.94)

€ (1.60)

€ (1.72)

Number of shares used for calculation (basic)

41,650,907

32,502,555

40,182,701

32,465,935

Number of shares used for calculation (diluted)

^[1]

41,650,907

32,502,555

40,182,701

32,465,935

[1]

A total of 4,479,691 warrants outstanding as of June 30, 2018 can potentially dilute earnings per share in the future, but have not been included in the calculation of diluted earnings per share because they are antidilutive for the periods presented. Similarly, a total of 3,689,506 warrants outstanding as of June 30, 2017 are also considered antidilutive for the periods presented and have not been included in the calculation.

Condensed Consolidated Interim Statements of Profit or Loss and Other Comprehensive Income / (Loss) (Parenthetical) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Warrants [member]
Warrants outstanding	4,479,691	3,689,506

Condensed Consolidated Interim Statements of Financial Position - EUR (€) € in Thousands	Jun. 30, 2018	Dec. 31, 2017
Non-current assets
Intangible assets	€ 3,495	€ 3,495
Property, plant and equipment	2,597	2,557
Deposits	1,115	293
Total non-current assets	7,207	6,345
Current assets
Trade receivables	17	188
Other receivables	1,826	1,410
Prepayments	5,934	6,907
Income taxes receivable	1,279	778
Cash and cash equivalents	352,601	195,351
Total current assets	361,657	204,634
Total assets	368,864	210,979
Equity
Share capital	5,619	4,967
Distributable equity	326,606	182,244
Total equity	332,225	187,211
Current liabilities
Trade payables and other payables	36,614	23,768
Income taxes payable	25
Total liabilities	36,639	23,768
Total equity and liabilities	€ 368,864	€ 210,979

Condensed Consolidated Interim Statements of Changes in Equity - EUR (€) € in Thousands	Total	Issued Capital [member]	Share Premium [member]	Foreign Currency Translation Reserve [member]	Share-based Payment Reserve [member]	Accumulated Deficit [member]
Equity at Dec. 31, 2016	€ 176,613	€ 4,354	€ 298,567	€ (79)	€ 13,084	€ (139,313)
Loss for the period	(55,845)					(55,845)
Other comprehensive income / (loss), net of tax	46			46
Total comprehensive income / (loss)	(55,799)			46		(55,845)
Share-based payment (Note 6)	5,010				5,010
Capital increase	644	11	633
Equity at Jun. 30, 2017	126,468	4,365	299,200	(33)	18,094	(195,158)
Equity at Dec. 31, 2017	187,211	4,967	422,675	(14)	22,793	(263,210)
Loss for the period	(64,152)					(64,152)
Other comprehensive income / (loss), net of tax	(7)			(7)
Total comprehensive income / (loss)	(64,159)			(7)		(64,152)
Share-based payment (Note 6)	8,901				8,901
Capital increase	213,390	652	212,738
Cost of capital increase	(13,118)		(13,118)
Equity at Jun. 30, 2018	€ 332,225	€ 5,619	€ 622,295	€ (21)	€ 31,694	€ (327,362)

- Definition

The amount of residual interest in the assets of the entity after deducting all its liabilities.

+ References + Details

- Definition

The total of income less expenses, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

+ References

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+ Details

Condensed Consolidated Interim Cash Flow Statements € in Thousands	6 Months Ended
	Jun. 30, 2018 EUR (€)	Jun. 30, 2017 EUR (€)
Operating activities
Net profit / (loss) for the period	€ (64,152)	€ (55,845)
Reversal of finance income	(16,270)	(288)
Reversal of finance expenses	11	7,956
Reversal of tax charge	(206)	(51)
Adjustments for:
Share-based payment	8,901	5,010
Depreciation and amortization	397	349
Changes in working capital:
Deposits	(822)	(11)
Trade receivables	171	(163)
Other receivables	(416)	(549)
Prepayments	973	(4,116)
Trade payables and other payables	12,839	2,504
Cash flows generated from / (used in) operations	(58,574)	(45,204)
Finance income received	2,004	288
Finance expenses paid	(11)	(55)
Income taxes received / (paid)	(270)	(196)
Cash flows from / (used in) operating activities	(56,851)	(45,167)
Investing activities
Acquisition of property, plant and equipment	(437)	(585)
Cash flows from / (used in) investing activities	(437)	(585)
Financing activities
Capital increase	213,390	644
Cost of capital increase	(13,118)
Cash flows from / (used in) financing activities	200,272	644
Increase / (decrease) in cash and cash equivalents	142,984	(45,108)
Cash and cash equivalents at January 1	195,351	180,329
Effect of exchange rate changes on balances held in foreign currencies	14,266	(7,901)
Cash and cash equivalents at June 30	352,601	€ 127,320
Restricted cash included in cash and cash equivalents	€ 5,468

General Information	6 Months Ended
General Information	Jun. 30, 2018
Text block1 [abstract]
General Information	Note 1—General Information Ascendis Pharma A/S, together with its subsidiaries, is a biopharmaceutical company applying its innovative TransCon technology to build a leading, fully integrated biopharma company. Ascendis Pharma A/S was incorporated in 2006 and is headquartered in Hellerup, Denmark. Unless the context otherwise requires, references to the “Company,” “we,” “us” and “our” refer to Ascendis Pharma A/S and its subsidiaries. The address of the Company’s registered office is Tuborg Boulevard 12, DK-2900, Hellerup, Denmark. On February 2, 2015, the Company completed an initial public offering, or IPO, which resulted in the listing of American Depositary Shares, or ADSs, representing the Company’s ordinary shares, under the symbol “ASND” in the United States on The Nasdaq Global Select Market. The Company’s Board of Directors approved these unaudited condensed consolidated interim financial statements on August 29, 2018.

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2018
Text block1 [abstract]
Summary of Significant Accounting Policies	Note 2—Summary of Significant Accounting Policies *Basis of Preparation* The unaudited condensed consolidated interim financial statements of the Company are prepared in accordance with International Accounting Standard 34, “Interim Financial Reporting”. Certain information and disclosures normally included in the consolidated financial statements prepared in accordance with International Financial Reporting Standards (“IFRS”) have been condensed or omitted. Accordingly, these condensed consolidated interim financial statements should be read in conjunction with the Company’s annual consolidated financial statements for the year ended December 31, 2017 and accompanying notes, which have been prepared in accordance with IFRS as issued by the International Accounting Standards Board, and as adopted by the European Union. The preparation of financial statements in conformity with IFRS requires the use of certain critical accounting estimates and requires management to exercise its judgment in the process of applying the Company’s accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the condensed consolidated interim financial statements are disclosed in Note 3. *Changes in Accounting Policies* As of January 1, 2018, the Company has adopted IFRS 9, “Financial Instruments”, which introduces a new impairment model for financial assets measured at amortized cost based on an expected credit loss model, which currently applies to the Company’s bank deposits and trade receivables. The adoption of IFRS 9 had no material impact on the Company’s financial reporting. Further, the Company has adopted IFRS 15, “Revenue from Contracts with Customers”, which establishes a single, comprehensive framework for revenue recognition, based on a five-step model, which applies to the Company’s licensing agreements with multiple activities. IFRS 15 was adopted using the ‘retrospective method with the cumulative effect of initially applying this standard recognized at the date of the initial application’. The adoption of IFRS 15 had no impact on the Company’s financial reporting. Except for the adoption of these two new standards, the accounting policies applied when preparing these condensed consolidated interim financial statements have been applied consistently to all the periods presented, unless otherwise stated and are consistent with those of the Company’s most recent annual consolidated financial statements. A description of our accounting policies is provided in the Accounting Policies section of the audited consolidated financial statements as of and for the year ended December 31, 2017. *Changes in Presentation* The Company has changed its accounting policy for the presentation of exchange rate gains and losses in the Unaudited Condensed Consolidated Interim Statements of Profit or Loss and Other Comprehensive Income / (Loss). On the basis that the foreign exchange rate movements primarily impact the Company’s balance of cash and cash equivalents, exchange rate gains and losses are now reported net for the accumulated period and not as an aggregation of the quarterly reported exchange rate gains and losses. The Company believes that the revised presentation more appropriately presents the overall impact of changes in foreign exchange rates. The change has had no effect on the reported comparative figures for profit or loss, assets, liabilities, cash flows or earnings per share.

Critical Accounting Judgments and Key Sources of Estimation Uncertainty	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Critical Accounting Judgments and Key Sources of Estimation Uncertainty	Note 3—Critical Accounting Judgments and Key Sources of Estimation Uncertainty In the application of our accounting policies, we are required to make judgments, estimates and assumptions about the carrying amounts of assets and liabilities that are not readily apparent from other sources. The estimates and associated assumptions are based on historical experience and other factors that are considered to be relevant. Actual results may differ from these estimates. The estimates and underlying assumptions are reviewed on an ongoing basis. Revisions to accounting estimates are recognized in the period in which the estimate is revised if the revision affects only that period, or in the period of the revision and future periods if the revision affects both current and future periods. Critical judgments made in the process of applying our accounting policies and that have the most significant effect on the amounts recognized in our unaudited condensed consolidated financial statements relate to revenue recognition, share-based payment, internally generated intangible assets, and joint arrangements / collaboration agreements. The key sources of estimation uncertainty that have a significant risk of causing a material adjustment to the carrying amount of assets and liabilities within the next financial year relate to impairment of goodwill and to recognition of accruals for manufacturing and clinical trial activities. There have been no changes to the application of significant accounting estimates, and no impairment losses have been recognized during the first six months of 2018 or 2017. The unaudited condensed consolidated interim financial statements do not include all disclosures for critical accounting estimates and judgments that are required in the annual consolidated financial statements, and should be read in conjunction with the Company’s annual consolidated financial statements for the year ended December 31, 2017.

Revenue

6 Months Ended

Jun. 30, 2018

Text block1 [abstract]

Revenue

Note 4—Revenue


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(EUR’000)				(EUR’000)
Revenue from the rendering of services		18		444		46		816

Total revenue		18		444		46		816

Revenue from external customers (geographical)
USA		18		444		46		816

Total revenue		18		444		46		816

Segment Information	6 Months Ended
Segment Information	Jun. 30, 2018
Text block1 [abstract]
Segment Information	Note 5—Segment Information We are managed and operated as one business unit. No separate business areas or separate business units have been identified in relation to product candidates or geographical markets. Accordingly, we do not disclose information on business segments or geographical markets, except for the geographical information on revenue included in Note 4.

Warrants and Share-based Payment

6 Months Ended

Jun. 30, 2018

Text block1 [abstract]

Warrants and Share-based Payment

Note 6—Warrants and Share-based Payment

Share-based payment

Ascendis Pharma A/S has established warrant programs, equity-settled share-based payment transactions, as an incentive for all of our employees, members of our Board of Directors and select external consultants.

Warrants are granted by the Board of Directors in accordance with authorizations given to it by the shareholders of Ascendis Pharma A/S. As of June 30, 2018, 6,630,437 warrants had been granted, of which 19,580 warrants have been cancelled, 1,918,670 warrants have been exercised, 2,168 warrants have expired without being exercised, and 210,328 warrants have been forfeited. As of June 30, 2018, our Board of Directors was authorized to grant up to 3,985,875 additional warrants to our employees, board members and select consultants without pre-emptive subscription rights for the shareholders of Ascendis Pharma A/S. Each warrant carries the right to subscribe for one ordinary share of a nominal value of DKK 1. The exercise price is fixed at the fair market value of our ordinary shares at the time of grant as determined by our Board of Directors. The exercise prices of outstanding warrants under our warrant programs range from €6.48 to €60.23 depending on the grant dates. Vested warrants may be exercised in two or four annual exercise periods. Apart from exercise prices and exercise periods, the programs are similar.

Warrant Activity

The following table specifies the warrant activity during the six months ended June 30, 2018:


	Total Warrants			Weighted Average Exercise Price EUR
Outstanding at December 31, 2017		4,621,154			17.62

Granted during the period		189,625			49.34
Exercised during the period		(317,825	)		11.16
Forfeited during the period		(13,263	)		24.24
Expired during the period		—			—

Outstanding at June 30, 2018		4,479,691			19.40

Vested at the balance sheet date		2,248,000			13.48

Warrant Compensation Costs

Warrant compensation costs are determined with basis in the grant date fair value of the warrants granted and recognized over the vesting period.

Three Months Ended
June 30,

Six Months Ended
June 30,

2018

2017

2018

2017

(EUR’000)

Research and development costs

1,964

1,122

4,349

2,411

General and administrative expenses

2,258

1,183

4,552

2,599

Total warrant compensation costs

4,222

2,305

8,901

5,010

Share Capital	6 Months Ended
Share Capital	Jun. 30, 2018
Text block1 [abstract]
Share Capital	Note 7—Share Capital The share capital of Ascendis Pharma A/S consists of 41,841,590 shares at a nominal value of DKK 1, all in the same share class. On February 26, 2018, the Company completed the sale and issuance of 4,539,473 ADSs in a public offering, increasing the Company’s share capital from 36,984,292 shares to 41,523,765 shares. In April and June 2018, an aggregate of 317,825 warrants were exercised, increasing the Company’s share capital from 41,523,765 shares to 41,841,590 shares.

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Text block1 [abstract]
Subsequent Events	Note 8—Subsequent Events No events have occurred after the balance sheet date that would have a significant impact on the results or financial position of the Company.

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2018
Text block1 [abstract]
Changes in Presentation	*Changes in Presentation* The Company has changed its accounting policy for the presentation of exchange rate gains and losses in the Unaudited Condensed Consolidated Interim Statements of Profit or Loss and Other Comprehensive Income / (Loss). On the basis that the foreign exchange rate movements primarily impact the Company’s balance of cash and cash equivalents, exchange rate gains and losses are now reported net for the accumulated period and not as an aggregation of the quarterly reported exchange rate gains and losses. The Company believes that the revised presentation more appropriately presents the overall impact of changes in foreign exchange rates. The change has had no effect on the reported comparative figures for profit or loss, assets, liabilities, cash flows or earnings per share.
Basis of Preparation	*Basis of Preparation* The unaudited condensed consolidated interim financial statements of the Company are prepared in accordance with International Accounting Standard 34, “Interim Financial Reporting”. Certain information and disclosures normally included in the consolidated financial statements prepared in accordance with International Financial Reporting Standards (“IFRS”) have been condensed or omitted. Accordingly, these condensed consolidated interim financial statements should be read in conjunction with the Company’s annual consolidated financial statements for the year ended December 31, 2017 and accompanying notes, which have been prepared in accordance with IFRS as issued by the International Accounting Standards Board, and as adopted by the European Union. The preparation of financial statements in conformity with IFRS requires the use of certain critical accounting estimates and requires management to exercise its judgment in the process of applying the Company’s accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the condensed consolidated interim financial statements are disclosed in Note 3.
Changes in Accounting Policies	*Changes in Accounting Policies* As of January 1, 2018, the Company has adopted IFRS 9, “Financial Instruments”, which introduces a new impairment model for financial assets measured at amortized cost based on an expected credit loss model, which currently applies to the Company’s bank deposits and trade receivables. The adoption of IFRS 9 had no material impact on the Company’s financial reporting. Further, the Company has adopted IFRS 15, “Revenue from Contracts with Customers”, which establishes a single, comprehensive framework for revenue recognition, based on a five-step model, which applies to the Company’s licensing agreements with multiple activities. IFRS 15 was adopted using the ‘retrospective method with the cumulative effect of initially applying this standard recognized at the date of the initial application’. The adoption of IFRS 15 had no impact on the Company’s financial reporting. Except for the adoption of these two new standards, the accounting policies applied when preparing these condensed consolidated interim financial statements have been applied consistently to all the periods presented, unless otherwise stated and are consistent with those of the Company’s most recent annual consolidated financial statements. A description of our accounting policies is provided in the Accounting Policies section of the audited consolidated financial statements as of and for the year ended December 31, 2017.

Revenue (Tables)

6 Months Ended

Jun. 30, 2018

Text block1 [abstract]

Summary of Segment Revenue


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(EUR’000)				(EUR’000)
Revenue from the rendering of services		18		444		46		816

Total revenue		18		444		46		816

Revenue from external customers (geographical)
USA		18		444		46		816

Total revenue		18		444		46		816

Warrants and Share-based Payment (Tables)

6 Months Ended

Jun. 30, 2018

Summary of Warrant Compensation Cost

Warrant compensation costs are determined with basis in the grant date fair value of the warrants granted and recognized over the vesting period.

Three Months Ended
June 30,

Six Months Ended
June 30,

2018

2017

2018

2017

(EUR’000)

Research and development costs

1,964

1,122

4,349

2,411

General and administrative expenses

2,258

1,183

4,552

2,599

Total warrant compensation costs

4,222

2,305

8,901

5,010

Warrants [member]

Summary of Warrant Activity

The following table specifies the warrant activity during the six months ended June 30, 2018:


	Total Warrants			Weighted Average Exercise Price EUR
Outstanding at December 31, 2017		4,621,154			17.62

Granted during the period		189,625			49.34
Exercised during the period		(317,825	)		11.16
Forfeited during the period		(13,263	)		24.24
Expired during the period		—			—

Outstanding at June 30, 2018		4,479,691			19.40

Vested at the balance sheet date		2,248,000			13.48

Revenue - Summary of Segment Revenue (Detail) - EUR (€) € in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of operating segments [line items]
Revenue from the rendering of services	€ 18	€ 444	€ 46	€ 816
Total revenue	18	444	46	816
Revenue from external customers (geographical)
Total revenue	18	444	46	816
Total revenue	18	444	46	816
USA [member]
Disclosure of operating segments [line items]
Total revenue	18	444	46	816
Revenue from external customers (geographical)
Total revenue	18	444	46	816
Total revenue	€ 18	€ 444	€ 46	€ 816

- Definition

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

+ References

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-URIDate 2017-03-09

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IAS
-Number 18
-IssueDate 2017-01-01
-Paragraph 35
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=18&date=2017-03-02&anchor=para_35_b&doctype=Standard&book=B
-URIDate 2017-03-09

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 102
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_102&doctype=Standard
-URIDate 2017-03-09

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph B12
-Subparagraph b
-Clause v
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B12_b_v&doctype=Appendix&seq=2
-URIDate 2017-03-09

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph B10
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B10_b&doctype=Appendix&seq=2
-URIDate 2017-03-09

+ Details

Segment Information - Additional Information (Detail)	6 Months Ended
Segment Information - Additional Information (Detail)	Jun. 30, 2018 Segment
Disclosure of operating segments [abstract]
Number of reportable segment	1

Warrants and Share-based Payment - Warrant Activity - Additional Information (Detail)		3 Months Ended
	Jun. 30, 2018 EUR (€) shares	Jun. 30, 2018 EUR (€) shares	Jun. 30, 2018 kr / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share nominal value \| kr / shares			kr 1
Warrants [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Aggregate number of other equity instruments granted	6,630,437
Aggregate number of other equity instruments cancelled \| shares	19,580	19,580
Aggregate number of other equity instruments exercised	1,918,670	317,825
Aggregate number of other equity instruments expired	2,168
Aggregate number of other equity instruments forfeited	210,328
Number of other equity instruments authorized	3,985,875	3,985,875
Share nominal value \| kr / shares			kr 1
Warrants [member] \| Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price \| €	€ 6.48	€ 6.48
Warrants [member] \| Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price \| €	€ 60.23	€ 60.23

Warrants and Share-based Payment - Schedule of Warrant Activity (Detail) - Warrants [member]	6 Months Ended
	Jun. 30, 2018 EUR (€)
Disclosure Of Warrant Activity [Line Items]
Beginning balance	4,621,154
Granted during the period	189,625
Exercised during the period	(317,825)
Forfeited during the period	(13,263)
Expired during the period	0
Ending balance	4,479,691
Vested at the balance sheet date	2,248,000
Beginning balance	€ 17.62
Granted during the period	49.34
Exercised during the period	11.16
Forfeited during the period	24.24
Expired during the period	0
Ending balance	19.40
Vested at the balance sheet date	€ 13.48

Warrants and Share-based Payment - Summary of Warrant Compensation Cost (Detail) - Warrants [member] - EUR (€) € in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total warrant compensation costs	€ 4,222	€ 2,305	€ 8,901	€ 5,010
Research and development cost [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total warrant compensation costs	1,964	1,122	4,349	2,411
General and administrative expense [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total warrant compensation costs	€ 2,258	€ 1,183	€ 4,552	€ 2,599

Share Capital - Additional Information (Detail)			3 Months Ended
Share Capital - Additional Information (Detail)	Jun. 30, 2018 kr / shares shares	Feb. 26, 2018 shares	Jun. 30, 2018 kr / shares shares	Feb. 25, 2018 shares
Disclosure of classes of share capital [line items]
Number of shares issued	41,841,590		41,841,590
Share nominal value \| kr / shares	kr 1		kr 1
Number of shares issued public offering		4,539,473
Number of shares outstanding	41,841,590	41,523,765	41,841,590	36,984,292
Warrants [member]
Disclosure of classes of share capital [line items]
Share nominal value \| kr / shares	kr 1		kr 1
Aggregate number of warrants exercised	1,918,670		317,825