Notes on the Consolidated Balance Sheets - Contract liabilities (Details) - EUR (€) € in Thousands	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Disclosure Of Consolidated Balance Sheet [Abstract]
Non-current contract liabilities	€ 3	€ 4
Current contract liabilities	37,516	36,840
Total contract liabilities	37,519	€ 36,844
Increase in contract liabilities through adjustment to revenue	675
Revenue that was included in contract liability balance at beginning of period	€ 30,857

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Number 15
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- Definition

The amount of current contract liabilities. [Refer: Contract liabilities]

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- Definition

The increase (decrease) in contract liabilities resulting from cumulative catch-up adjustments to revenue. [Refer: Contract liabilities; Revenue from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
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- Definition

The amount of non-current contract liabilities. [Refer: Contract liabilities]

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- Definition

The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers]

+ References

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No definition available.

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