Notes on the Consolidated Statements of Operations and Comprehensive Loss - Employee benefits (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Income Statement [Abstract]
Wages and salaries	€ 19,405	€ 12,451	€ 11,367
Social security contribution	2,566	2,329	2,016
Equity-settled share-based payments	2,335	4,091	1,166
Termination benefits	1,266	283	430
Other employee benefits	1,592	786	447
Total employee benefits expenses	€ 27,164	€ 19,940	€ 15,426

The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

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The amount of long-term employee benefits other than post-employment benefits and termination benefits. Such benefits may include long-term paid absences, jubilee or other long-service benefits, long-term disability benefits, long-term profit-sharing and bonuses and long-term deferred remuneration. [Refer: Employee benefits expense]

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A class of employee benefits expense that represents social security contributions. [Refer: Employee benefits expense]

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The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense]

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A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense]

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