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Revenue from collaboration agreements - Additional Information (Detail) € in Thousands, $ in Millions | 12 Months Ended |
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Dec. 31, 2020 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Dec. 31, 2020 USD ($)
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |  |
Contract with customers liability | € 132,075 |  | € 161,374 |  |
Capitalized costs of contract net of amortization | 1,200 |  | 1,500 |  |
Amortization of contract costs capitalized | 300 |  | 200 | € 40 |
Potential milestone payment payable | 1,600 |  |  |  | $ 2
Amgen Collaboration Agreement [Member] |  |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |  |
Upfront payment received | 28,000 | $ 30 |  |  |
Contract with customers liability revenue recognized | 4,900 |  | 6,200 | 1,500 |
Contract with customers liability | 10,000 |  | 15,000 |  |
Amgen Collaboration Agreement [Member] | Development And Commercial Milestone Payments [Member] |  |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |  |
Milestone payment receivable | $ |  |  |  |  | 525
Genmab Collaboration Agreement [Member] |  |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |  |
Upfront payment received | 46,000 | 54 |  |  |
Contract with customers liability revenue recognized | 11,200 |  | 11,200 | € 2,300 |
Contract with customers liability | 26,000 |  | 35,000 |  |
Genmab Collaboration Agreement [Member] | Milestone Payment For Licensed Product [Member] |  |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |  |
Milestone payment receivable | $ |  |  |  |  | 550
BMS Collaboration Agreement [Member] |  |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |  |
Upfront payment received | 68,000 | 75 |  |  |
Contract with customers liability revenue recognized | 11,500 |  | 1,100 |  |
Contract with customers liability | 55,000 |  | 66,500 |  |
BMS Collaboration Agreement [Member] | Option Exercise Development Commecial And Regulatory Milestone Payments [Member] |  |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |  |
Milestone payment receivable | $ |  |  |  |  | 505
GSK Collaboration Agreement [Member] |  |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |  |
Upfront payment received | $ |  | $ 45 |  |  |
Contract with customers liability revenue recognized | 3,700 |  | 0 |  |
Contract with customers liability | € 41,000 |  | € 45,000 |  |
GSK Collaboration Agreement [Member] | Milestone Programs Based On The Program [Member] |  |  |  |  |
Disclosure Of Revenue From Contract With Customers [Line Items] |  |  |  |  |
Milestone payment receivable | $ |  |  |  |  | $ 575

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- Definition The amount of amortisation for assets recognised from the costs incurred to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers; Amortisation expense] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 128 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_128_b&doctype=Standard -URIDate 2020-01-01 + Details
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Period Type: | duration

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- Definition The amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 128 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_128_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 116 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_b&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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- Definition Milestone payment receivable. + References No definition available. + Details
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- Definition Potential milestone payment payable. + References No definition available. + Details
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- Definition Upfront payment received. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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