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Share listing expense and change in fair value of warrant liabilities - 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 |  |
Warrants [Member] |  |  |
Disclosure of detailed information about share listing expense [Line Items] |  |  |
Closing price of ARYA Warrants on Nasdaq as of July 1, 2020 | € / shares | € 2.35 | € 4.82 |
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 | € 243,100 |  |
Cash and cash equivalents held in ARYA's trust account | 128,849 |  |
Current liabilities by ARYA | 3,921 | € 3,900 |
ARYA's identifiable net assets | 90,284 | € 90,300 |
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 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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