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Income Tax - Schedule of Effective Tax Rate (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Deferred tax expense (income) [abstract] |  |  |
Net profit (loss) | € 67,259 | € (101,221) | € (65,144)
Tax expense (income) | (2,215) | 428 | 576
Net profit (loss) before tax | € 69,474 | € (101,649) | € (65,721)
Tax rate in France | 27.37% | 28.92% | 32.02%
Theoretical group tax rate in France | € (19,018) | € 29,401 | € 21,046
Increase / decrease in tax benefit arising from : |  |  |
Tax credits | 1,512 | 1,739 | 2,588
Permanent differences | 833 | (404) | 3,341
Differences between rates | 7,323 | 172 | 125
Tax losses for the period, unrecognised as deferred tax assets | 0 | (28,603) | (25,274)
Utilisation of previously unrecognised tax losses | 5,590 | 0 | 0
IFRS adjustments without tax incidence | (129) | (358) | (530)
Non recognition of deffered tax assets related to temporary differences | (24) | (775) | (114)
Recognition of deferred tax assets against deferred tax liabilities | 430 | (706) | (889)
Tax effects related to the renegociation of the convertible debt | 1,370 | 0 | 0
Others | € (102) | € (39) | € 284
Effective income rate | (3.19%) | (0.42%) | (0.88%)

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