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Operating Income - Schedule of Other Income (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Other Income [Line Items] |  |  |
Other income | € 5,510 | € 6,993 | € 10,122
CIR tax credit |  |  |
Disclosure Of Other Income [Line Items] |  |  |
Other income | 5,282 | 6,020 | 8,125
Other operating income |  |  |
Disclosure Of Other Income [Line Items] |  |  |
Other income | 223 | 968 | 1,992
Government grants and subsidies |  |  |
Disclosure Of Other Income [Line Items] |  |  |
Other income | € 5 | € 5 | € 5

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