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Financial Assets and Liabilities (Details) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | € 120,417 | € 39,545 | € 59,612
Financial liabilities | 20,177 | 9,594 | 10,575
Financial assets, at fair value | 120,417 | 39,545 | 59,612
Financial liabilities, at fair value | 20,177 | 9,594 | 10,575
Liabilities carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 20,177 | 9,594 | 10,575
Long-term debt |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 10,037 | 2 | 74
Financial liabilities, at fair value | 10,037 | 2 | 74
Long-term debt | Liabilities carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 10,037 | 2 | 74
Short-term debt |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 18 | 113 | 151
Financial liabilities, at fair value | 18 | 113 | 151
Short-term debt | Liabilities carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 18 | 113 | 151
Trade payables |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 6,923 | 7,491 | 8,372
Financial liabilities, at fair value | 6,923 | 7,491 | 8,372
Trade payables | Liabilities carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 6,923 | 7,491 | 8,372
Other miscellaneous payables |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 3,198 | 1,988 | 1,978
Financial liabilities, at fair value | 3,198 | 1,988 | 1,978
Other miscellaneous payables | Liabilities carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 3,198 | 1,988 | 1,978
Financial assets carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 118,626 | 39,545 | 59,612
Financial assets at fair value through profit or loss |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 1,791 |  |
Long-term deposit accounts and security deposits |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets |  |  | 108
Financial assets, at fair value |  |  | 108
Long-term deposit accounts and security deposits | Financial assets carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets |  |  | 108
Long term deposit accounts |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 1,698 | 792 |
Financial assets, at fair value | 1,698 | 792 |
Long term deposit accounts | Financial assets carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 1,698 | 792 |
Long-term security deposits |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 8 | 8 |
Financial assets, at fair value | 8 | 8 |
Long-term security deposits | Financial assets carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 8 | 8 |
Short-term deposit accounts |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 7,336 |  |
Financial assets, at fair value | 7,336 |  |
Short-term deposit accounts | Financial assets carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 7,336 |  |
Accrued income |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 2,000 | 2,000 | 1,932
Financial assets, at fair value | 2,000 | 2,000 | 1,932
Accrued income | Financial assets carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 2,000 | 2,000 | 1,932
Trade receivables |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 48 | 4 | 6
Financial assets, at fair value | 48 | 4 | 6
Trade receivables | Financial assets carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 48 | 4 | 6
Other receivables |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 1,849 | 900 | 874
Financial assets, at fair value | 1,849 | 900 | 874
Other receivables | Financial assets carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 1,849 |  | 874
Foreign currency forwards |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 1,791 |  |
Financial assets, at fair value | 1,791 |  |
Foreign currency forwards | Financial assets at fair value through profit or loss |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 1,791 |  |
Cash and cash equivalents |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 105,687 | 35,840 | 56,692
Financial assets, at fair value | 105,687 | 35,840 | 56,692
Cash and cash equivalents | Financial assets carried at amortized cost |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | € 105,687 | € 35,840 | € 56,692

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