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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