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Company Information - USD 107.7 million initial public offering (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
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Jul. 15, 2020 USD ($) director contract $ / shares shares | Jul. 15, 2020 EUR (€) director contract shares | Jul. 31, 2020 USD ($) | Feb. 29, 2020 EUR (€) | Oct. 31, 2019 EUR (€) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Jul. 15, 2020 EUR (€) shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Gross proceeds from Initial Public Offering | $ 107.7 |  | $ 107.7 | € 14,700,000 | € 8,900,000 |  |  |  |
Share capital |  |  |  |  |  | € 386,000 | € 268,000 | € 223,000 |
Number of new insurances entered | contract | 2 | 2 |  |  |  |  |  |  |
Insurance amount | $ | $ 3.6 |  |  |  |  |  |  |  |
Contracts coverage period |  |  |  |  |  | 1 year |  |  |
Prepaid expenses |  |  |  |  |  | € 3,313,000 | 495,000 | 1,184,000 |
Offering expense |  |  |  |  |  | 7,397,000 | € 324,000 | € 3,079,000 |
Other Operating Income (Expenses) |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Additional expense including offering expense |  |  |  |  |  | 1,800,000 |  |  |
Offering expense |  |  |  |  |  | 800,000 |  |  |
Other Current Assets and Receivables |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Prepaid expenses |  |  |  |  |  | € 1,800,000 |  |  |
American Depositary Shares |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Issue of ordinary shares (in shares) | shares | 7,478,261 | 7,478,261 |  |  |  |  |  |  |
Price per share | $ / shares | $ 14.40 |  |  |  |  |  |  |  |
Gross proceeds from Initial Public Offering | $ 107.7 | € 94,100,000 |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  | € 383,930.11
Number of shares issued | shares | 38,393,011 |  |  |  |  |  |  |  | 38,393,011
Public Offering of Securities Insurance |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Insurance amount |  |  |  |  |  |  |  |  | € 1,600,000
Directors and Officers Liability Insurance |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Insurance amount |  |  |  |  |  |  |  |  | € 2,000,000
Number of executive directors under directors' and officers' liability insurance | director | 2 | 2 |  |  |  |  |  |  |

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