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Loss per share - Schedule of Basic and Diluted Loss Per Share (Details) - EUR (€) € / shares in Units, € in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings per share [abstract]
Net loss for the period (in thousands of euros)	€ (47,063)	€ (33,590)	€ (50,915)
Weighted average number of shares (in shares)	34,733,418,000	24,385,827,000	21,631,514,000
Basic loss per share (in euro per share)	€ (1.35)	€ (1.38)	€ (2.35)
Diluted loss per share (in euro per share)	€ (1.35)	€ (1.38)	€ (2.35)

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

+ References

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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- Definition

The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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