Share-based payments - Equity share option 2017 (Equity settled) (Details) - Equity share option 2017 (Equity settled)	3 Months Ended	12 Months Ended
Mar. 31, 2020 Options € / shares shares	Dec. 31, 2019
Share-based payments
Number of options granted \| Options	805,308
Number of common shares per option granted \| shares	1
Exercise price of share options \| € / shares	€ 0.12
Lock-up period	180 days
Weighted average remaining contractual life of outstanding share options	9 years 8 months 12 days	10 years

The period subsequent to the completion of the initial public offering in which the options may not be exercised.

No definition available.

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- Definition

The number of common shares per share options granted in a share-based payment arrangement.

+ References

No definition available.

+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The number of share options granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_ii&doctype=Standard
-URIDate 2019-03-27

+ Details

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- Definition

The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

+ Details

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- Definition

The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard
-URIDate 2019-03-27

+ Details

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- Details

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