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Related Party Transaction (Details) - Sarissa Group $ in Millions | Feb. 12, 2018 USD ($) director
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Related Parties |
Appointment of designees as as members of the Company's Board of Directors | 3
Total number of directors nominated for election | 5
Number of new directors nominated for election | 3
Number of current directors nominated for election | 2
Payments for agreements with related parties | $ | $ 2.7

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- Definition The number of current directors nominated for election. + References No definition available. + Details
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Namespace Prefix: | inva_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of designees appointed as members of the company. + References No definition available. + Details
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Namespace Prefix: | inva_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of directors nominated for election in person. + References No definition available. + Details
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Namespace Prefix: | inva_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of new directors nominated for election. + References No definition available. + Details
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Namespace Prefix: | inva_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow during the period associated with agreements with related parties. + References No definition available. + Details
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Namespace Prefix: | inva_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition 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. + References No definition available. + Details
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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=inva_SarissaCapitalManagementLpAndCertainOfItsAffiliatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |