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Share-based payments - Additional Information (Detail) $ / shares in Units, $ in Thousands, € in Millions |  |  |  |  | 4 Months Ended | 12 Months Ended | 47 Months Ended |  |  |  |  |
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Dec. 17, 2020 $ / shares | Sep. 14, 2020 shares $ / shares | Jul. 01, 2020 $ / shares | Jun. 30, 2020 shares $ / shares | Sep. 30, 2019 $ / shares | Dec. 31, 2020 EUR (€) shares | Dec. 31, 2020 EUR (€) $ / shares | Dec. 31, 2019 EUR (€) shares $ / shares | Dec. 31, 2018 EUR (€) $ / shares | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement fair value per share |  |  | $ 13.79 |  |  |  |  |  |  |  |  |  |  |  |
Granted On December 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  |  |  |  |  |  |  | 5,447 |  |  |  |  |  |  |
Share based compensation by share based payment arrangement exercise price per share granted |  |  |  |  |  |  |  | $ 23.82 |  |  |  |  |  |  |
Performance Based Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average share price of share options granted |  | $ 9.16 |  | $ 15.15 |  |  |  |  |  |  |  |  |  |  |
Performance Based Options [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum market capitalization | $ |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |
Performance Based Options [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum market capitalization | $ |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |
Performance Based Options [Member] | Tranche Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum market capitalization | $ |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |
Performance Based Options [Member] | Granted On June 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  |  |  | 3,644,000 |  | 3,644,000 |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement exercise price per share granted |  |  |  |  |  |  | $ 10.00 |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement fair value per share |  |  |  | $ 11.10 |  |  | 11.10 |  |  |  |  |  |  |  |
Performance Based Options [Member] | Granted On September 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  | 255,000 |  |  |  | 255,000 |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement exercise price per share granted |  |  |  |  |  |  | 10.00 |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement fair value per share |  | $ 6.41 |  |  |  |  | 6.41 |  |  |  |  |  |  |  |
Additional Grants Under 2020 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  |  |  |  |  | 1,963,566 |  |  |  |  |  |  |  |  |
Weighted average share price of share options granted | $ 9.70 | 9.16 |  | 15.15 |  |  |  |  |  |  |  |  |  |  |
Additional Grants Under 2020 Plan [Member] | ARYA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  |  |  |  |  | 1,087,242 |  |  |  |  |  |  |  |  |
Additional Grants Under 2020 Plan [Member] | Granted On June 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  |  |  |  |  | 1,087,417 |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement exercise price per share granted |  |  |  |  |  |  | 10.00 |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement fair value per share |  |  |  | 11.29 |  |  | 11.29 |  |  |  |  |  |  |  |
Additional Grants Under 2020 Plan [Member] | Granted On September 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  |  |  |  |  | 74,000 |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement exercise price per share granted |  |  |  |  |  |  | 9.72 |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement fair value per share |  | $ 9.25 |  |  |  |  | 9.25 |  |  |  |  |  |  |  |
Additional Grants Under 2020 Plan [Member] | Granted On December 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  |  |  |  |  | 802,149 |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement exercise price per share granted |  |  |  |  |  |  | 9.70 |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement fair value per share | $ 6.73 |  |  |  |  |  | 6.73 |  |  |  |  |  |  |  |
Converted Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average share price of share options granted |  |  |  | $ 15.15 |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement fair value per share |  |  |  |  |  |  | 4.83 |  |  |  |  |  |  |  |
Converted Options [Member] | Granted On June 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  |  |  |  |  | 632,384 |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement exercise price per share granted |  |  |  |  |  |  | $ 2.49 |  |  |  |  |  |  |  |
Share Appreciation Rights Two Thousand And Ten Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares to be purchased by third party |  |  |  |  |  | 50.00% | 50.00% |  |  | 50.00% | 50.00% |  |  |  |
Liabilities arising from share based payment arrangement | € |  |  |  |  |  |  |  | $ 2.1 | € 0.2 |  |  |  |  |  |
Fair value of stock appreciation rights | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000 | $ 160,000 |
2016 Tandem Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares to be purchased by third party |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Share based compensation by share based payment equity instruments other than shares vesting period |  |  |  |  |  |  |  |  |  | five |  |  |  |  |
Fair value of stock appreciation rights | $ |  |  |  |  |  |  |  |  |  |  |  | $ 160,000 | $ 350,000 |  |
Weighted average share price of share options granted |  |  |  |  | $ 16.94 |  |  | $ 67.87 | € 27.21 |  |  |  |  |  |
Modification Of Awards Under Two Thousand Ten And Two Thousand And Sixteen Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment award per share payable |  |  |  |  |  | 10.00% | 10.00% |  |  | 10.00% | 10.00% |  |  |  |
Cash payment to employees stock based awards | € |  |  |  |  |  | € 8.9 |  |  |  |  |  |  |  |  |
Modification Of Awards Under Two Thousand Ten And Two Thousand And Sixteen Plan [Member] | Active Employees [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of cash proceeds to be reinvested |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Modification Of Awards Under Two Thousand Ten And Two Thousand And Sixteen Plan [Member] | Active Employees [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of cash proceeds to be reinvested |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Modification Of Awards Under Two Thousand Ten And Two Thousand And Sixteen Plan [Member] | Management Members [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of cash proceeds to be reinvested |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Modification Of Two Thousand And Ten Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expenses modification of awards | € |  |  |  |  |  | € 2.6 |  |  |  |  |  |  |  |  |
Modification Of Two Thousand And Sixteen Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to additional paid in capital due to modification of previously settled equity awards | € |  |  |  |  |  | 4.3 |  |  |  |  |  |  |  |  |
Modification Of Two Thousand And Sixteen Plan [Member] | Share Reinvestment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expenses modification of awards | € |  |  |  |  |  | € 4.1 |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement options granted during the period | shares |  |  |  |  |  | 733,598 |  |  |  |  |  |  |  |  |
Fair value of stock appreciation rights | € |  |  |  |  |  | € 8.5 | $ 8.5 |  |  | € 8.5 |  |  |  |  |
Weighted average share price of share options granted |  |  |  |  |  |  | $ 15.15 |  |  |  |  |  |  |  |
Modification Of Two Thousand And Sixteen Plan [Member] | Share Reinvestment [Member] | Matching Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement exercise price per share granted |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement term of stock options |  |  |  |  |  | ten-year |  |  |  |  |  |  |  |  |
Date of vesting of stock options |  |  |  |  |  | Jul. 31, 2021 |  |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement fair value per share |  |  |  |  |  |  | $ 10.59 |  |  |  |  |  |  |  |
Share based compensation by share based payment arrangement grant date |  |  |  |  |  | July 1, 2020 |  |  |  |  |  |  |  |  |

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- Definition The description of the maximum term of options granted for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 51 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_51_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_51_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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