Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

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_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Increase (Decrease) In Operating Lease, Right-Of-Use Asset

No definition available.

Name:	vtl_IncreaseDecreaseInOperatingLeaseRightOfUseAsset
Namespace Prefix:	vtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Lessee, Operating Lease, Beginning of Lease, Rent Holiday Period

No definition available.

Name:	vtl_LesseeOperatingLeaseBeginningOfLeaseRentHolidayPeriod
Namespace Prefix:	vtl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Lessee, Operating Lease, Extension of Lease, Rent Holiday Period

No definition available.

Name:	vtl_LesseeOperatingLeaseExtensionOfLeaseRentHolidayPeriod
Namespace Prefix:	vtl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Operating And Variable Leases, Cost

No definition available.

Name:	vtl_OperatingAndVariableLeasesCost
Namespace Prefix:	vtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Operating Lease, Incremental Borrowing Rate

No definition available.