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Fair Value Measurements - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |
Investment maturity period | 2 years
Investment expected maturity period | 12 months

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- Definition Investment expected maturity period. + References No definition available. + Details
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Namespace Prefix: | annx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Investment maturity period. + References No definition available. + Details
Name: | annx_InvestmentMaturityPeriod
Namespace Prefix: | annx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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