CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENTS OF OPERATIONS
Amortization of capitalized fees paid to a related party	$ 13,823	$ 13,823	$ 13,823

Represents the amortization of capitalized fees paid to a related party.

No definition available.

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