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Operating Expense - Summary of Operating Expenses and Other Operating Income (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Operating Expenses And Other Operating Income Expenses [Line Items] |  |  |
Research and development expenses | € (35,166) | € (59,097) | € (66,170)
General and administrative expenses | (16,153) | (14,270) | (17,265)
Marketing and market access expenses | (1,539) | (11,216) | (13,708)
Reorganization and restructuring expenses | (142) | (5,308) | 0
Other operating income (expenses) | (763) | (764) | (1,649)
TOTAL | 53,763 | 90,655 | 98,793
Current provisions | 313 | 1,031 | 2,061
Research tax credit litigation |  |  |
Disclosure Of Operating Expenses And Other Operating Income Expenses [Line Items] |  |  |
Current provisions | 1,800 | 1,800 |
Raw materials & consumables used |  |  |
Disclosure Of Operating Expenses And Other Operating Income Expenses [Line Items] |  |  |
Research and development expenses | (1,305) | (1,876) | (2,017)
General and administrative expenses | (161) | (202) | (177)
Marketing and market access expenses | (1) | (7) | (8)
Reorganization and restructuring expenses | (5) | 0 | 0
Other operating income (expenses) | 0 | 0 | 0
TOTAL | 1,472 | 2,085 | 2,202
Contracted research & development activities conducted by third parties |  |  |
Disclosure Of Operating Expenses And Other Operating Income Expenses [Line Items] |  |  |
Research and development expenses | (18,808) | (39,216) | (41,509)
General and administrative expenses | (85) | (92) | (59)
Marketing and market access expenses | (1) | (2) | 0
Reorganization and restructuring expenses | 0 | 0 | 0
Other operating income (expenses) | 0 | 0 | 0
TOTAL | 18,895 | 39,310 | 41,568
Employee expenses |  |  |
Disclosure Of Operating Expenses And Other Operating Income Expenses [Line Items] |  |  |
Research and development expenses | (8,192) | (11,554) | (11,740)
General and administrative expenses | (7,379) | (6,936) | (7,598)
Marketing and market access expenses | (783) | (1,298) | (1,645)
Reorganization and restructuring expenses | 0 | 8 | 0
Other operating income (expenses) | 0 | 0 | 0
TOTAL | 16,354 | 19,779 | 20,984
Other expenses (maintenance, fees, travel, taxes) |  |  |
Disclosure Of Operating Expenses And Other Operating Income Expenses [Line Items] |  |  |
Research and development expenses | (4,593) | (5,465) | (6,188)
General and administrative expenses | (8,003) | (6,545) | (8,972)
Marketing and market access expenses | (741) | (9,818) | (11,979)
Reorganization and restructuring expenses | (2,343) | (2,141) | 0
Other operating income (expenses) | (338) | (684) | (1,668)
TOTAL | 16,019 | 24,655 | 28,807
Depreciation, amortization & impairment charges |  |  |
Disclosure Of Operating Expenses And Other Operating Income Expenses [Line Items] |  |  |
Research and development expenses | (2,247) | (985) | (4,716)
General and administrative expenses | (541) | (495) | (458)
Marketing and market access expenses | (13) | (90) | (76)
Reorganization and restructuring expenses | 2,206 | (3,175) | 0
Other operating income (expenses) | 4 | 0 | 0
TOTAL | 591 | 4,746 | 5,251
Gain / (loss) on disposal of property, plant & equipment |  |  |
Disclosure Of Operating Expenses And Other Operating Income Expenses [Line Items] |  |  |
Research and development expenses | (19) | 0 | 0
General and administrative expenses | 15 | 0 | 0
Marketing and market access expenses | 0 | 0 | 0
Reorganization and restructuring expenses | 0 | 0 | 0
Other operating income (expenses) | (429) | (80) | 19
TOTAL | € 433 | € 80 | € (19)

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