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Financial Risks Management - Sensitivity of Group's Cash and Cash Equivalents and Expenses to Variation 10% of US Dollar against Euro (Details) | 12 Months Ended |  |  |  |
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Dec. 31, 2021 EUR (€) $ / shares | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 EUR (€) € / shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 EUR (€) $ / shares | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 EUR (€) € / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 EUR (€) $ / shares | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 EUR (€) € / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 EUR (€)
Foreign Exchange Rates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | € 258,756,000 | € 258,756,000 | € 258,756,000 |  | € 171,029,000 | € 171,029,000 | € 171,029,000 |  | € 276,748,000 | € 276,748,000 | € 276,748,000 |  | $ 81,713,000 | $ 111,221,000 | $ 153,438,000 | € 207,240,000
Expenses | $ |  |  |  | $ 12,566,000 |  |  |  | $ 47,277,000 |  |  |  | $ 40,355,000 |  |  |  |
Euros equivalent to US dollar | 0.8829 | 1 | 0.84542 | 1.13261 | 0.8149 | 1 | 0.87755 | 1.2271 | 0.8902 | 1 | 0.89341 | 1.1234 |  |  |  |
10% Increase (Decrease) in US Dollar vs Euro |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Exchange Rates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | € 72,146,000 | € 72,146,000 | € 72,146,000 |  | € 90,637,000 | € 90,637,000 | € 90,637,000 |  | € 136,582,000 | € 136,582,000 | € 136,582,000 |  |  |  |  |
Expenses |  | 11,095,000 |  |  |  | 38,528,000 |  |  |  | 35,922,000 |  |  |  |  |  |
10% Increase of US Dollar vs Euro |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Exchange Rates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 80,163,000 | 80,163,000 | 80,163,000 |  | 100,708,000 | 100,708,000 | 100,708,000 |  | 151,758,000 | 151,758,000 | 151,758,000 |  |  |  |  |
Expenses |  | 12,328,000 |  |  |  | 42,808,000 |  |  |  | 39,914,000 |  |  |  |  |  |
10% Decrease of US Dollar vs Euro |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Exchange Rates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | € 65,588,000 | 65,588,000 | € 65,588,000 |  | € 82,398,000 | 82,398,000 | € 82,398,000 |  | € 124,166,000 | 124,166,000 | € 124,166,000 |  |  |  |  |
Expenses |  | € 10,086,000 |  |  |  | € 35,025,000 |  |  |  | € 32,657,000 |  |  |  |  |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_i&doctype=Standard -URIDate 2021-03-24 + Details
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