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Short-term deposits and cash and cash equivalents - Additional Information (Details)	Dec. 31, 2022	Dec. 31, 2021
Short term deposits Line [Line Items]
Short term deposits weighted average interest rate point in time	5.21%	0.00%

X

- Definition

Short term deposits Line.

+ References

No definition available.

+ Details

Name:	pre_ShortTermDepositsLineLineItems
Namespace Prefix:	pre_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Short term deposits weighted average interest rate point in time.

+ References

No definition available.

+ Details

Name:	pre_ShortTermDepositsWeightedAverageInterestRatePointInTime
Namespace Prefix:	pre_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant