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Fair Value of Financial Instruments - Summary of Financial Assets And Liabilities Carrying Values By Category And Fair Values (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |  |
Current and non current financial assets | € 4,431 | € 1,458 | € 1,727
Level 1 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial assets | 258,756 | 171,029 | 276,748
Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial assets | 842 | 1,563 | 911
Fair value of financial liabilities | 83,889 | 203,367 | 213,669
Level 3 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial assets | 3,133 |  |
Fair value of financial liabilities | 3,229 | 3,229 | 3,229
Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current and non current financial assets | 262,731 | 172,592 | 277,658
Carrying value of Assets at fair value through profit and loss | 261,889 | 171,029 | 276,748
Carrying value loans and receivables | 842 | 1,563 | 911
Financial liabilities | 87,118 | 206,596 | 216,898
Aggregate nominal amount | 87,118 | 206,596 | 216,898
Equity investments | Level 3 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial assets | 3,133 |  |
Equity investments | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current and non current financial assets | 3,133 |  |
Carrying value of Assets at fair value through profit and loss | 3,133 |  |
Loans | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial assets | 388 | 352 | 307
Loans | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current and non current financial assets | 388 | 352 | 307
Carrying value loans and receivables | 388 | 352 | 307
Deposits and guarantees | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial assets | 397 | 418 | 396
Deposits and guarantees | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current and non current financial assets | 397 | 418 | 396
Carrying value loans and receivables | 397 | 418 | 396
Trade receivables | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial assets | 57 | 793 | 207
Trade receivables | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current and non current financial assets | 57 | 793 | 207
Carrying value loans and receivables | 57 | 793 | 207
Cash and cash equivalents | Level 1 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial assets | 258,756 | 171,029 | 276,748
Cash and cash equivalents | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current and non current financial assets | 258,756 | 171,029 | 276,748
Carrying value of Assets at fair value through profit and loss | 258,756 | 171,029 | 276,748
Conditional advances | Level 3 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial liabilities | 3,229 | 3,229 | 3,229
Conditional advances | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial liabilities | 3,229 | 3,229 | 3,229
Aggregate nominal amount | 3,229 | 3,229 | 3,229
Convertible loans | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial liabilities | 48,097 | 170,782 | 165,454
Convertible loans | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial liabilities | 48,097 | 170,782 | 165,454
Aggregate nominal amount | 48,097 | 170,782 | 165,454
Bank loans | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial liabilities | 15,824 | 1,540 | 2,645
Bank loans | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial liabilities | 15,824 | 1,540 | 2,645
Aggregate nominal amount | 15,824 | 1,540 | 2,645
Obligations under finance leases | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial liabilities | 7,069 | 10,131 | 12,281
Obligations under finance leases | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial liabilities | 7,069 | 10,131 | 12,281
Aggregate nominal amount | 7,069 | 10,131 | 12,281
Accrued interests | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial liabilities | 16 |  | 1
Accrued interests | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial liabilities | 16 |  | 1
Aggregate nominal amount | 16 |  | 1
Other financial loans and borrowings | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial liabilities |  | 7 | 7
Other financial loans and borrowings | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial liabilities |  | 7 | 7
Aggregate nominal amount |  | 7 | 7
Trade payables | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial liabilities | 12,304 | 20,337 | 32,753
Trade payables | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial liabilities | 12,304 | 20,337 | 32,753
Aggregate nominal amount | 12,304 | 20,337 | 32,753
Other payables | Level 2 | Fair value |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Fair value of financial liabilities | 579 | 569 | 527
Other payables | Gross |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial liabilities | 579 | 569 | 527
Aggregate nominal amount | € 579 | € 569 | € 527

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