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Commitments and Contingencies - Employment Agreements (Details) | Dec. 31, 2020 USD ($)
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Executive Officers |
Employment Agreements |
Maximum aggregate severance payments | $ 720,000

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- Definition The maximum aggregate severance payments payable to executive officers under the terms of employment agreements. + References No definition available. + Details
Name: | anvs_MaximumAggregateSeverancePayments
Namespace Prefix: | anvs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | srt_TitleOfIndividualAxis=srt_ExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |