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Intangible assets - Summary of Changes to intangible assets (Detail) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Beginning Balance | € 1,008 |
Currency translation differences |  | € 31
Ending Balance | 914 | 1,008
Patent And Licenses [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Beginning Balance | 851 |
Currency translation differences |  | 31
Ending Balance | 730 | 851
Software Licenses [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Beginning Balance | 157 |
Ending Balance | 184 | 157
Gross carrying amount [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Beginning Balance | 1,863 | 1,752
Additions | 104 | 91
Currency translation differences | (97) | 20
Ending Balance | 1,870 | 1,863
Gross carrying amount [member] | Patent And Licenses [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Beginning Balance | 1,220 | 1,201
Currency translation differences | (88) | 19
Ending Balance | 1,132 | 1,220
Gross carrying amount [member] | Software Licenses [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Beginning Balance | 643 | 551
Additions | 104 | 91
Currency translation differences | (9) | 1
Ending Balance | 738 | 643
Accumulated impairment [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Beginning Balance | (855) | (713)
Additions | 126 | 111
Currency translation differences | (25) |
Ending Balance | (956) | (855)
Accumulated impairment [member] | Patent And Licenses [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Beginning Balance | (369) | (314)
Additions | 56 | 24
Currency translation differences | (22) |
Ending Balance | (403) | (369)
Accumulated impairment [member] | Software Licenses [Member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Beginning Balance | (486) | (399)
Additions | 71 | 87
Currency translation differences | (3) |
Ending Balance | € (554) | € (486)

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in intangible assets and goodwill resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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