Commitments and Contingencies (Details) - Specific performance litigation	May 17, 2017 director
Legal Proceedings
Minimum number of affirmative vote	5
Number of board of directors	7
Business days	5 days

Represents number of business days for giving advance written notice, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	inva_NumberOfBusinessDaysForAdvanceWrittenNotice
Namespace Prefix:	inva_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration