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Equity and Other Investments and Fair Value Measurements - (Additional Information) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair value of assets or liabilities transfer between levels	$ 0	$ 0

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- Definition

Fair Value Of Assets Or Liabilities Transfer Between Levels

+ References

No definition available.

+ Details

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Namespace Prefix:	inva_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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