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Revenue - Schedule of Revenue Recognized in Statements of Profit or Loss (Parenthetical) (Detail) - EUR (€) € in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue [abstract]
Deferred revenue from associate	€ 579	€ 1,013	€ 1,155	€ 2,215

X

- Definition

Deferred revenue from associate.

+ References

No definition available.

+ Details

Name:	asnd_DeferredRevenueFromAssociate
Namespace Prefix:	asnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	ifrs-full_RevenueAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration