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<!--Created on: 3/18/2019 1:25:22 PM-->
<!--Modified on: 3/18/2019 1:25:22 PM-->
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  <element id="qtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockIssuedAndOutstandingRestrictedAndUnrestrictedStockAwards" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockIssuedAndOutstandingRestrictedAndUnrestrictedStockAwards" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEvergreenProvisionAnnualIncreasePercentage" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEvergreenProvisionAnnualIncreasePercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_HarvardUniversityMember" name="HarvardUniversityMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_LoanAgreementMember" name="LoanAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_TermLoanMember" name="TermLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_TermOfAverageSellingPricesUsedToDetermineEstimateOfCurrentSellingPrice" name="TermOfAverageSellingPricesUsedToDetermineEstimateOfCurrentSellingPrice" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ImpliedWarrantyPeriod" name="ImpliedWarrantyPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_NumberOfServiceVisits" name="NumberOfServiceVisits" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ObligationToIssueWarrantsInShares" name="ObligationToIssueWarrantsInShares" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_MinorityInterestInPreferredStockOfPrivatelyHeldCompanyMember" name="MinorityInterestInPreferredStockOfPrivatelyHeldCompanyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_RestrictedAndUnrestrictedStockAwardsMember" name="RestrictedAndUnrestrictedStockAwardsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ShareBasedCompensationAwardTrancheFourMember" name="ShareBasedCompensationAwardTrancheFourMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_AushonAcquisitionMember" name="AushonAcquisitionMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredPropertyPlantAndEquipmentAndOtherNonCurrentAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredPropertyPlantAndEquipmentAndOtherNonCurrentAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_BusinessCombinationRecognizedIdentifiableLiabilitiesAssumedContractualObligations" name="BusinessCombinationRecognizedIdentifiableLiabilitiesAssumedContractualObligations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_DiscountRateUsedToDetermineFairValueOfIntangibleAssets" name="DiscountRateUsedToDetermineFairValueOfIntangibleAssets" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_AccruedDevelopmentCosts" name="AccruedDevelopmentCosts" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePriceAbstract" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePriceAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_LicenseAndServiceMember" name="LicenseAndServiceMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentageDurationTranche2" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentageDurationTranche2" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ShareBasedCompensationAwardTrancheFiveMember" name="ShareBasedCompensationAwardTrancheFiveMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CompanyHeadquartersMember" name="CompanyHeadquartersMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_LesseeOperatingLeaseTermOfContract" name="LesseeOperatingLeaseTermOfContract" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CapacityOfBuilding" name="CapacityOfBuilding" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_StockCompensationExpenseIncludedInResearchAndDevelopmentExpenses" name="StockCompensationExpenseIncludedInResearchAndDevelopmentExpenses" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_StockCompensationExpenseIncludedInCostOfGoodsAndServicesSold" name="StockCompensationExpenseIncludedInCostOfGoodsAndServicesSold" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_LaboratoryAndManufacturingEquipmentMember" name="LaboratoryAndManufacturingEquipmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_OfficeFurnitureAndEquipmentMember" name="OfficeFurnitureAndEquipmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ComputersAndSoftwareMember" name="ComputersAndSoftwareMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ProceedsFromIssuanceOfNotesPayableAndWarrantsNetOfIssuanceCosts" name="ProceedsFromIssuanceOfNotesPayableAndWarrantsNetOfIssuanceCosts" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_LetterOfCreditReducedAt65MonthsAfterCommencementDate" name="LetterOfCreditReducedAt65MonthsAfterCommencementDate" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_Seriesa3RedeemableConvertiblePreferredStockMember" name="Seriesa3RedeemableConvertiblePreferredStockMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_Seriesc1RedeemableConvertiblePreferredStockMember" name="Seriesc1RedeemableConvertiblePreferredStockMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_SeriesdRedeemableConvertiblePreferredStockMember" name="SeriesdRedeemableConvertiblePreferredStockMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_Seriesd1RedeemableConvertiblePreferredStockMember" name="Seriesd1RedeemableConvertiblePreferredStockMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_MilestoneAmountReceivedForExchangeOnShares" name="MilestoneAmountReceivedForExchangeOnShares" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_RedeemableConvertiblePreferredSharesConversionThresholdGrossProceeds" name="RedeemableConvertiblePreferredSharesConversionThresholdGrossProceeds" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_RedeemableConvertiblePreferredSharesConversionMinimumOutstandingSharesPercentage" name="RedeemableConvertiblePreferredSharesConversionMinimumOutstandingSharesPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_RedeemableConvertiblePreferredSharesCumulativeDividendAnnualRate" name="RedeemableConvertiblePreferredSharesCumulativeDividendAnnualRate" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_RedeemableConvertiblePreferredSharesNonCumulativeDividendAnnualRate" name="RedeemableConvertiblePreferredSharesNonCumulativeDividendAnnualRate" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_RedeemableConvertiblePreferredSharesCumulativeAccruedDividends" name="RedeemableConvertiblePreferredSharesCumulativeAccruedDividends" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_EligibilityToElectNumberOfDirectors" name="EligibilityToElectNumberOfDirectors" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_RedeemableConvertiblePreferredSharesRedemptionNumberOfInstalments" name="RedeemableConvertiblePreferredSharesRedemptionNumberOfInstalments" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_PreferredStockVotesPerCommonShare" name="PreferredStockVotesPerCommonShare" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ScheduleOfUsefulLivesForPropertyPlantEquipmentTableTextBlock" name="ScheduleOfUsefulLivesForPropertyPlantEquipmentTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_AssumptionsUsedToDetermineFairValueOfUnobservableInputs" name="AssumptionsUsedToDetermineFairValueOfUnobservableInputs" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityConversion" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityConversion" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_Volatility" name="Volatility" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_WarrantyContract" name="WarrantyContract" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_OneCustomerMember" name="OneCustomerMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_SeriesbRedeemableConvertiblePreferredStockAt2.00PerShareMember" name="SeriesbRedeemableConvertiblePreferredStockAt2.00PerShareMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_SeriescRedeemableConvertiblePreferredStockAt3.3299PerShareMember" name="SeriescRedeemableConvertiblePreferredStockAt3.3299PerShareMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_MilestonePayment2Member" name="MilestonePayment2Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_MilestonePayment3Member" name="MilestonePayment3Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_Amendment2LoanAgreementMember" name="Amendment2LoanAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
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  <element id="qtrx_Amendment4LoanAgreementMember" name="Amendment4LoanAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_Amendment5LoanAgreementMember" name="Amendment5LoanAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_DebtInstrumentWarrantsIssuedFairValue" name="DebtInstrumentWarrantsIssuedFairValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_DebtInstrumentMaximumAmountToInvest" name="DebtInstrumentMaximumAmountToInvest" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_DebtInstrumentMaximumAmountToConvertIntoShares" name="DebtInstrumentMaximumAmountToConvertIntoShares" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_DebtInstrumentInvestedAmount" name="DebtInstrumentInvestedAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_DebtInstrumentMinimumEquityFinancing" name="DebtInstrumentMinimumEquityFinancing" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_RestrictedCashAndDepositsPolicyTextBlock" name="RestrictedCashAndDepositsPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CollaborationAndLicenseArrangementsNumberOfPayments" name="CollaborationAndLicenseArrangementsNumberOfPayments" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CollaborationAndLicenseArrangementsRevenueRelatedToLicenseAndPrototype" name="CollaborationAndLicenseArrangementsRevenueRelatedToLicenseAndPrototype" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CollaborationAndLicenseArrangementsFeasibilityPeriod" name="CollaborationAndLicenseArrangementsFeasibilityPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CollaborationAndLicenseArrangementsCashReceived" name="CollaborationAndLicenseArrangementsCashReceived" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CollaborationAndLicenseArrangementsAllocableConsideration" name="CollaborationAndLicenseArrangementsAllocableConsideration" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CommonStockOptionsAndUnvestedRestrictedCommonStockMember" name="CommonStockOptionsAndUnvestedRestrictedCommonStockMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" name="ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_StockIssuedDuringPeriodValueWarrantsExercised" name="StockIssuedDuringPeriodValueWarrantsExercised" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_WarrantsExercisesInPeriod" name="WarrantsExercisesInPeriod" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_StockIssuedDuringPeriodValueStockOptionsAndVestingRestrictedStockExercised" name="StockIssuedDuringPeriodValueStockOptionsAndVestingRestrictedStockExercised" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_StockIssuedDuringPeriodSharesStockOptionsAndVestingRestrictedStockExercised" name="StockIssuedDuringPeriodSharesStockOptionsAndVestingRestrictedStockExercised" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_StockIssuedDuringPeriodValueNewIssuesOfferingCost" name="StockIssuedDuringPeriodValueNewIssuesOfferingCost" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_OperatingLeasesFutureMinimumPaymentsDueInFiveAndThereafter" name="OperatingLeasesFutureMinimumPaymentsDueInFiveAndThereafter" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_IncomeTaxBenefitOnNetLossesAndTaxCredits" name="IncomeTaxBenefitOnNetLossesAndTaxCredits" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopmentCredits" name="DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopmentCredits" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CollaborationAndLicenseArrangements.AmountOfAdditionalPayment" name="CollaborationAndLicenseArrangements.AmountOfAdditionalPayment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ExclusiveAgreementMember" name="ExclusiveAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_WarrantsToPurchaseShares" name="WarrantsToPurchaseShares" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_FairValueOfPreferredWarrants" name="FairValueOfPreferredWarrants" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_AdjustmentsToAdditionalPaidInCapitalWarrantLiabilityReclassifiedToEquity" name="AdjustmentsToAdditionalPaidInCapitalWarrantLiabilityReclassifiedToEquity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ProbabilityOfInitialPublicOffering" name="ProbabilityOfInitialPublicOffering" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_WarrantsToPurchaseSharesInCashless" name="WarrantsToPurchaseSharesInCashless" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_Amendment2016Member" name="Amendment2016Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_EffectOfRestatementMember" name="EffectOfRestatementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CostOfLicenses" name="CostOfLicenses" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_FederalCorporateIncomeTaxRate" name="FederalCorporateIncomeTaxRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_EffectOfNewAccountingPrincipleDuringPeriod" name="EffectOfNewAccountingPrincipleDuringPeriod" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_TotalCostOfRevenuesAndOperatingExpenses" name="TotalCostOfRevenuesAndOperatingExpenses" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_FairValueOfCommonWarrants" name="FairValueOfCommonWarrants" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_Amendment6LoanAgreementMember" name="Amendment6LoanAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CertificateOfDepositAssociatedWithLease" name="CertificateOfDepositAssociatedWithLease" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_DeferredIncomeTaxLiabilitiesAccruedBonusAdjustment" name="DeferredIncomeTaxLiabilitiesAccruedBonusAdjustment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ShareBasedCompensationArrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ShareBasedCompensationArrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_ShareBasedCompensationarrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageCancelledPrice" name="ShareBasedCompensationarrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageCancelledPrice" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_CustomersOutsideOfUnitedStatesMember" name="CustomersOutsideOfUnitedStatesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_PphMember" name="PphMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_AggregateContributionsToCommitments" name="AggregateContributionsToCommitments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" name="DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_IncomeTaxLineItems" name="IncomeTaxLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_GoodwillRelatedToHistoricalTaxBasis" name="GoodwillRelatedToHistoricalTaxBasis" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_LaboratoryAndManufacturingInstrumentsMember" name="LaboratoryAndManufacturingInstrumentsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="qtrx_NumberOfManufacturingInstruments" name="NumberOfManufacturingInstruments" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
