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Commitments and Contingencies - Risks and Uncertainties (Details)	Mar. 31, 2020 item
Commitments and Contingencies
Number of patients who completed treatment prior to temporary suspension of enrollment	14
Total number of enrolled patients in the Phase 2a trial	24

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- Definition

The number of enrolled patients who had completed treatment prior to the temporary suspension of enrollment of new patients in the Phase 2a trial.

+ References

No definition available.

+ Details

Name:	anvs_NumberOfEnrolledPatientsCompletedTreatment
Namespace Prefix:	anvs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- Definition

The total number of enrolled patients in the Phase 2a trial.

+ References

No definition available.

+ Details

Name:	anvs_NumberOfEnrolledPatientsTotalTrialSize
Namespace Prefix:	anvs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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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