Name:	us-gaap_ClassOfStockLineItems
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The percentage rate used to calculate dividend payments on preferred stock.

No definition available.

Name:	us-gaap_PreferredStockDividendRatePercentage
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Data Type:	num:percentItemType
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The cash inflow associated with the amount received from entity's first offering of stock to the public.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromIssuanceInitialPublicOffering
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Data Type:	xbrli:monetaryItemType
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Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

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Per share or per unit amount of equity securities issued.

No definition available.

Name:	us-gaap_SharesIssuedPricePerShare
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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Name:	dei_LegalEntityAxis=alvr_ElevateBioLimitedLiabilityCompanyMember
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Name:	srt_RangeAxis=srt_MinimumMember
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