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Subsequent Events - Additional information (Detail) $ in Millions	Aug. 25, 2021 USD ($)
Nonadjusting Events After Reporting Period [Member]
Disclosure of non-adjusting events after reporting period [line items]
Reversal of prior period write-downs of inventories expected to have a positive impact on research and development costs	$ 50

X

- Definition

Reversal of prior period write downs of inventories expected impact on research and development costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	asnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

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

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=asnd_NonadjustingEventsAfterReportingPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: