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Segment Information - Schedule of Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting [Abstract]
Cash, cash equivalents and marketable securities	$ 1,501,497	$ 595,351

X

- Definition

Cash, Cash Equivalents, And Marketable Securities

+ References

No definition available.

+ Details

Name:	rna_CashCashEquivalentsAndMarketableSecurities
Namespace Prefix:	rna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration