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Employee Costs - Additional Information (Detail) - Employees	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Board of Directors [member]
Disclosure of employee compensation costs [line items]
Number of persons			7
Board of Directors [member] | Maximum [Member]
Disclosure of employee compensation costs [line items]
Number of persons	7	7
Board of Directors [member] | Minimum [Member]
Disclosure of employee compensation costs [line items]
Number of persons	6	6
Executive Board [member]
Disclosure of employee compensation costs [line items]
Number of persons	4		2
Executive Board [member] | Maximum [Member]
Disclosure of employee compensation costs [line items]
Number of persons		4
Executive Board [member] | Minimum [Member]
Disclosure of employee compensation costs [line items]
Number of persons		2

X

- Definition

Disclosure of employee compensation costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	asnd_
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Balance Type:	na
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X

- Definition

Number of employees1.

+ References

No definition available.

+ Details

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Namespace Prefix:	asnd_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
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