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Fair Value Measurements - Additional Information (Detail)	12 Months Ended
	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

X

- Definition

Investment expected maturity period.

+ References

No definition available.

+ Details

Name:	annx_InvestmentExpectedMaturityPeriod
Namespace Prefix:	annx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

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