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Basic and Diluted Loss Per Share (Details) - EUR (€)
€ / shares in Units, € in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic and Diluted Loss Per Share      
Net loss for the period € (33,619) € (30,218) € (33,014)
Weighted average number of outstanding shares used for computing basic/diluted loss per share 33,874,751 23,519,897 20,540,979
Basic/diluted loss per share (in ) € (0.99) € (1.28) € (1.61)