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Legal Proceedings (Details)	6 Months Ended
Legal Proceedings (Details)	Jun. 30, 2022 Claim
Legal Proceedings [Abstract]
Number of claims dismissed	3

Represents the number of dismissed claims whose dismissal was compelled by a prior decision.

No definition available.

Name:	abcp_LossContingencyClaimsDismissedNumberOfClaimsWhoseDismissalWasCompelledByPriorDecision
Namespace Prefix:	abcp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

No definition available.

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