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Leases (Schedule Of Right-Of-Use Assets And Lease Liabilities By Lease Type) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Leases [Abstract]
Right-of-use assets	$ 6,119	$ 6,933
Total right-of-use assets	6,119	6,933
Lease liabilities	6,763	7,686
Total lease liabilities	$ 6,763	$ 7,686

X

- Definition

Total Lease Liabilities

+ References

No definition available.

+ Details

Name:	avbh_TotalLeaseLiabilities
Namespace Prefix:	avbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Total Right-of-Use Assets

+ References

No definition available.

+ Details

Name:	avbh_TotalRightOfUseAssets
Namespace Prefix:	avbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant