Cash and cash equivalents -Summary of Cash and Cash Equivalents (Detail) - EUR (€)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Text Block1 [Abstract]
Cash and cash equivalents	€ 209,353,132	€ 98,628,871	€ 20,326,372	€ 5,385,333

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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