DESCRIPTION OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Description of Operations (Details)	12 Months Ended
Dec. 31, 2017
GSK \| LABA collaboration and Strategic Alliance agreements
Description of Operations and Summary of Significant Accounting Policies
Percentage of economic interest in any future payments made under the agreements	15.00%

Represents the percentage of economic interest in any future payments made under the agreements.

No definition available.

Name:	inva_PercentageOfEconomicInterestOnFuturePaymentsUnderAgreements
Namespace Prefix:	inva_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration