0000950170-22-014726 | 10-Q | XBRL Viewer

Label	Element	Value
Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Exercisable Number	alvr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableNumber	2,311,528
Lessee Operating Estimated Lease Term	alvr_LesseeOperatingEstimatedLeaseTerm	4 years 3 months
Lessee Operating Estimated Lease Term	alvr_LesseeOperatingEstimatedLeaseTerm	3 years 9 months
Lessee Operating Estimated Lease Term	alvr_LesseeOperatingEstimatedLeaseTerm	2 years
Non Cash Lease Expense	alvr_NonCashLeaseExpense	$ 720,000
Non Cash Lease Expense	alvr_NonCashLeaseExpense	$ 210,000
Additional One Time Lease Period	alvr_AdditionalOneTimeLeasePeriod	5 years
Amortization And Accretion Of Discounts On Short Term Investments	alvr_AmortizationAndAccretionOfDiscountsOnShortTermInvestments	$ (49,000)
Amortization And Accretion Of Discounts On Short Term Investments	alvr_AmortizationAndAccretionOfDiscountsOnShortTermInvestments	$ (897,000)
Interim Financial Information Policy [Text Block]	alvr_InterimFinancialInformationPolicyTextBlock	Interim Financial Information The accompanying condensed consolidated balance sheet at June 30, 2022, and the condensed consolidated statements of operations and comprehensive loss, statements of changes in stockholders’ equity for the three and six months ended June 30, 2022 and 2021 and condensed consolidated statements of cash flows for the six months ended June 30, 2022 and 2021 are unaudited. The condensed consolidated interim financial statements have been prepared on the same basis as the audited annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments necessary for the fair presentation of the Company’s financial position at June 30, 2022 and the results of its operations for the three and six months ended June 30, 2022 and 2021 and its cash flows for the six months ended June 30, 2022 and 2021. The financial data and other information disclosed in these notes related to the three and six months ended June 30, 2022 and 2021 are also unaudited. The results for the three and six months ended June 30, 2022 are not necessarily indicative of results to be expected for the year ending December 31, 2022 or for any other subsequent interim period.
Accrued Research And Development Current	alvr_AccruedResearchAndDevelopmentCurrent	$ 6,746,000
Accrued Research And Development Current	alvr_AccruedResearchAndDevelopmentCurrent	3,573,000
Increase Decrease in Right of Use Asset Due to Modification	alvr_IncreaseDecreaseInRightOfUseAssetDueToModification	$ (5,506,000)
Percentage of Maximum Payroll Deductions of Base Salary or Wages	alvr_PercentageOfMaximumPayrollDeductionsOfBaseSalaryOrWages	15.00%
Lease Expiration Month And Year	alvr_LeaseExpirationMonthAndYear	2021-07
Lease Expiration Month And Year	alvr_LeaseExpirationMonthAndYear	2022-02
Share Based Compensation Arrangement By Share Based Payment Award Common Stock Issuable Upon Exercise Of Outstanding Options	alvr_ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockIssuableUponExerciseOfOutstandingOptions	7,894,302
Tenant Improvement Allowance To Be Reimbursed	alvr_TenantImprovementAllowanceToBeReimbursed	$ 3,100,000
Accrued Process Development and Manufacturing Costs Current	alvr_AccruedProcessDevelopmentAndManufacturingCostsCurrent	1,275,000
Accrued Process Development and Manufacturing Costs Current	alvr_AccruedProcessDevelopmentAndManufacturingCostsCurrent	$ 7,685,000
Recently Issued Accounting Pronouncements Not Yet Adopted Policy [Text Block]	alvr_RecentlyIssuedAccountingPronouncementsNotYetAdoptedPolicyTextBlock	Recently Issued Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 significantly changes the impairment model for most financial assets and certain other instruments. ASU 2016-13 will require immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets, which will generally result in earlier recognition of allowances for credit losses on loans and other financial instruments. ASU 2016-13 is effective for the Company’s fiscal year beginning after December 15, 2022 and subsequent interim periods. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements and related disclosures.
Gross Proceeds From Issuance Of Common Stock	alvr_GrossProceedsFromIssuanceOfCommonStock	$ 317,700,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Exercisable Weighted Average Remaining Contractual Term	alvr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageRemainingContractualTerm	8 years 3 months 7 days
Percentage of Maximum Discount Price on Purchase of Shares of Common Stock	alvr_PercentageOfMaximumDiscountPriceOnPurchaseOfSharesOfCommonStock	15.00%
Purchase Of Property And Equipment Included In Accounts Payable And Accrued Expenses	alvr_PurchaseOfPropertyAndEquipmentIncludedInAccountsPayableAndAccruedExpenses	$ 91,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Exercisable Intrinsic Value	alvr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableIntrinsicValue	$ 32,000
Lease Commencement Month And Year	alvr_LeaseCommencementMonthAndYear	2021-09
Lessee Operating Estimated Lease Expiring Month And Year	alvr_LesseeOperatingEstimatedLeaseExpiringMonthAndYear	2023-07
Lessee Operating Estimated Lease Expiring Month And Year	alvr_LesseeOperatingEstimatedLeaseExpiringMonthAndYear	2023-07
Lessee Operating Estimated Lease Expiring Month And Year	alvr_LesseeOperatingEstimatedLeaseExpiringMonthAndYear	2023-01
Tenant Improvement Allowance Reimbursement Period	alvr_TenantImprovementAllowanceReimbursementPeriod	2 years
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Fair Value of Common Stock	alvr_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueOfCommonStock	$ 5.87
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Fair Value of Common Stock	alvr_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValueOfCommonStock	$ 8.45
Unrealized Gain Loss On Available For Sale Securities	alvr_UnrealizedGainLossOnAvailableForSaleSecurities	$ (289,000)
Unrealized Gain Loss On Available For Sale Securities	alvr_UnrealizedGainLossOnAvailableForSaleSecurities	26,000
Sale of Stock Offering Costs	alvr_SaleOfStockOfferingCosts	$ 100,000
Offering Period, Description	alvr_OfferingPeriodDescription	(i) on the first trading day of the offering period or (ii) the last day of any offering period. The Company utilizes the Black Scholes option pricing model to compute the fair market value of the shares and compensation expense is recognized over the offering period. The first ESPP offering period was shortened in duration to three months and commenced on April 1, 2022 and ended on June 30, 2022. New six-month offering periods will commence each January 1 and July 1 thereafter during the term of the plan, with the administrator having the right to establish different offering periods.
Utilization Fee Payable	alvr_UtilizationFeePayable	$ 3,200,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Exercisable Weighted Average Exercise Price	alvr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageExercisePrice	$ 21.75
Lessee Operating Lease Lease Term Including Renewal Option	alvr_LesseeOperatingLeaseLeaseTermIncludingRenewalOption	2 years
Lessee Operating Lease Liability Payments Due After Year Four	alvr_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour	$ 13,068,000
Maximum Annual Increase Of Common Stock Reserved For Issuance	alvr_MaximumAnnualIncreaseOfCommonStockReservedForIssuance	1,222,707
Prepaid Utilization Fee	alvr_PrepaidUtilizationFee	$ 600,000
Number Of Shares Of Common Stock Issuable Upon Exercise Of Outstanding Options	alvr_NumberOfSharesOfCommonStockIssuableUponExerciseOfOutstandingOptions	64,042

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