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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Name:	us-gaap_DebtInstrumentFrequencyOfPeriodicPayment
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

Name:	us-gaap_LineOfCreditFacilityInterestRateDescription
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The cash inflow from a borrowing supported by a written promise to pay an obligation.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Interest rate floor.

No definition available.

Name:	vtvt_InterestRateFloor
Namespace Prefix:	vtvt_
Data Type:	num:percentItemType
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Name:	us-gaap_LongtermDebtTypeAxis=vtvt_LoanAndSecurityAgreementMember
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Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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Name:	us-gaap_LineOfCreditFacilityAxis=vtvt_HorizonTechnologyFinanceCorporationAndSiliconValleyBankMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_DebtInstrumentAxis=vtvt_DebtInstrumentTrancheOneMember
Namespace Prefix:
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Period Type: