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Intangibles Assets and Goodwill - Additional Information (Detail) - EUR (€) | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Impairment loss on intangible assets and goodwill | € 0 | € 0 |  |
Research and development expense | € 3,700,000 | € 3,362,000 | € 4,508,000 |
2017 Acquisitions [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  |  |  | € 2,041,000
2016 Acquisitions [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  |  |  | € 1,921,000

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