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Share listing expenses - Summary of Calculation of the Share listing expense (Detail) € / shares in Units, € in Thousands | 12 Months Ended |
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Dec. 31, 2020 EUR (€) shares Warrants € / shares | Jul. 01, 2020 EUR (€) shares Warrants € / shares | Jul. 01, 2020 $ / shares
Disclosure of detailed information about share listing expense [Line Items] |  |  |
Closing price of ARYA Ordinary Shares on Nasdaq as of July 1, 2020 | € / shares | € 0.01 |  |
IFRS 2 Expense on the closing date | € 152,787 |  |
Ordinary shares [member] |  |  |
Disclosure of detailed information about share listing expense [Line Items] |  |  |
Closing price of ARYA Ordinary Shares on Nasdaq as of July 1, 2020 | € / shares |  | € 0.01 |
ARYA [Member] |  |  |
Disclosure of detailed information about share listing expense [Line Items] |  |  |
Closing price of ARYA Ordinary Shares on Nasdaq as of July 1, 2020 | $ / shares |  |  | $ 15.15
Fair value of outstanding ARYA | 277,715 |  |
ARYA's identifiable net assets | 124,927 | € 124,900 |
IFRS 2 Expense on the closing date | € 152,787 |  |
ARYA [Member] | Warrants [Member] |  |  |
Disclosure of detailed information about share listing expense [Line Items] |  |  |
ARYA Shares | Warrants | 7,187,500 | 7,187,500 |
Closing price of ARYA Public Warrants on Nasdaq as of July 1, 2020 | € / shares | € 4.82 |  |
Fair value of outstanding ARYA | € 34,644 |  |
ARYA [Member] | Ordinary shares [member] |  |  |
Disclosure of detailed information about share listing expense [Line Items] |  |  |
ARYA Shares | shares | 17,968,750 | 17,968,750 |
Closing price of ARYA Ordinary Shares on Nasdaq as of July 1, 2020 | € / shares | € 13.53 |  |
Fair value of outstanding ARYA | € 243,071 |  |

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- Definition The fair value, at the acquisition date, of equity interests of the acquirer transferred as consideration in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B64 -Subparagraph f -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_f_iv&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Definition The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph IE72 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_IE72&doctype=Illustrative%20Examples -URIDate 2020-01-01 + Details
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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a_iii&doctype=Standard -URIDate 2020-01-01 + Details
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