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Commitments and Contingencies - Schedule of Rent Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Operating leases | $ 90 | $ 75 | $ 166 | $ 151
Short-term lease | 9 | 0 | 18 | 0
Total rent expense | $ 99 | $ 75 | $ 184 | $ 151

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- Definition Lease rent expense. + References No definition available. + Details
Name: | rna_LeaseRentExpense
Namespace Prefix: | rna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Short-term lease rent expense. + References No definition available. + Details
Name: | rna_ShortTermLeaseRentExpense
Namespace Prefix: | rna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration