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Income Tax - Summary of Deferred Tax Assets (Detail) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Statements [Line Items] |  |
Deferred tax assets | € 0 | € 0
Deferred tax liabilities | 0 | 0
Non-recognition due to history of losses | (2,016) | (3,075)
Deferred tax assets netting | (1,713) | (854)
Deferred tax liabilities netting | 1,713 | 854
Intangible assets [Member] |  |
Statements [Line Items] |  |
Deferred tax assets | 1,770 | 2,064
Deferred revenue [Member] |  |
Statements [Line Items] |  |
Deferred tax assets | 180 | 358
Lease liability [Member] |  |
Statements [Line Items] |  |
Deferred tax assets | 1,776 | 886
Deferred expenses [Member] |  |
Statements [Line Items] |  |
Deferred tax assets | 3 | 14
Recognized [Member] |  |
Statements [Line Items] |  |
Deferred tax assets | 3,729 | 3,929
Right-of-use asset [Member] |  |
Statements [Line Items] |  |
Deferred tax liabilities | 1,713 | 854
Recognized [Member] |  |
Statements [Line Items] |  |
Deferred tax liabilities | € 1,713 | 854
Other liabilities [Member] |  |
Statements [Line Items] |  |
Deferred tax assets |  | € 607

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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