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Financial Risk Management Objectives and Policies - Additional Information (Detail) - EUR (€) € in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | [2] | Dec. 31, 2017
Statements [Line Items] |  |  |  |  |
Cash and cash equivalents | € 207,530 | € 103,353 | [1] | € 39,367 | € 8,415
Historical volatility for shares, measurement input [member] | ARYA [Member] | Warrants [member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Percentage of reasonable possible increase in unobservable inputs | 10.00% |  |  |  |
Percentage of resonably possible decrease in unobservable inputs | 10.00% |  |  |  |
Increase decrease in fair value measurement due to a reasonably possible increase in unobservable input recognized in profit or loss before tax liabilities | € 1,700 |  |  |  |
Increase decrease in fair value measurement due to a reasonably possible decrease in unobservable input recognized in profit or loss before tax liabilities | € 1,700 |  |  |  |
Foreign Exchange Rates [Member] | ARYA [Member] | Warrants [member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Percentage of reasonable possible increase in unobservable inputs | 10.00% |  |  |  |
Percentage of resonably possible decrease in unobservable inputs | 10.00% |  |  |  |
Increase decrease in fair value measurement due to a reasonably possible increase in unobservable input recognized in profit or loss before tax liabilities | € 1,900 |  |  |  |
Increase decrease in fair value measurement due to a reasonably possible decrease in unobservable input recognized in profit or loss before tax liabilities | (1,500) |  |  |  |
Credit risk [member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Maximum exposure to credit risk | 232,000 | 119,000 |  |  |
Cash and cash equivalents | 208,000 | 103,000 |  |  |
Other financial assets | 24,000 | € 16,000 |  |  |
Currency risk [member] | Top of range [member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Foreign exchange gain (loss) | 10,900 |  |  |  |
Currency risk [member] | Bottom of range [member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Foreign exchange gain (loss) | € 13,200 |  |  |  |
Currency risk [member] | Euro [Member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Percentage Of Reasonably Possible Decrease In Foreign Currency Risk | 10.00% |  |  |  |
Currency risk [member] | US [Member] |  |  |  |  |
Statements [Line Items] |  |  |  |  |
Percentage Of Reasonably Possible Increase In Foreign Currency Risk | 10.00% |  |  |  |
[1] | See Note 2 for details regarding the change in presentation of Other financial assets
[2] | See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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