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Share-based payments - Summary of Employee Related Share Based Compensation Expense (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Detailed Information About Share Based Compensation Expense [Line Items]
Share-based compensation expense	€ 25,519	€ 2,016	€ 338
Research And Development Expense [Member]
Disclosure Of Detailed Information About Share Based Compensation Expense [Line Items]
Share-based compensation expense	14,546	1,556	238
General And Administrative Expense [Member]
Disclosure Of Detailed Information About Share Based Compensation Expense [Line Items]
Share-based compensation expense	€ 10,973	€ 460	€ 100

X

- Definition

The amount of expense from share-based payment transactions with employees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2020-01-01
-Paragraph 112
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+ Details

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X

- Definition

Disclosure of detailed information about share based compensation expense [Line Items].

+ References

No definition available.

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