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Income Taxes (Details)	6 Months Ended
	Jun. 30, 2026
M&F TTP Holdings LLC
Income Taxes [Line Items]
Amount of cash savings percentage	85.00%

X

- Definition

Income taxes.

+ References

No definition available.

+ Details

Name:	vtvt_IncomeTaxesLineItems
Namespace Prefix:	vtvt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of amount of cash savings.

+ References

No definition available.

+ Details

Name:	vtvt_PercentageOfAmountOfCashSavings
Namespace Prefix:	vtvt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=vtvt_MFTTPHoldingsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: