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SUBSEQUENT EVENTS (Details) - Subsequent events - Sarissa Group $ in Millions | Feb. 12, 2018 USD ($) director
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Subsequent Events |
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
Number of related party principals are the members of the Company's Board of Directors | 2

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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: | instant

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- 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

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- 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: | instant

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- Definition The number of new directors nominated for election. + References No definition available. + Details
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Namespace Prefix: | inva_
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Balance Type: | na
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- Definition The number of related party principals are the members of the Company's Board of Directors. + References No definition available. + Details
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Namespace Prefix: | inva_
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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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Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=inva_SarissaCapitalManagementLpAndCertainOfItsAffiliatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |