Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 11, 2020	Jun. 28, 2019
Document and Entity Information
Entity Registrant Name	INNOVIVA, INC.
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	000-30319
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3265960
Entity Address, Address Line One	1350 Old Bayshore Highway, Suite 400
Entity Address, City or Town	Burlingame
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94010
City Area Code	650
Local Phone Number	238-9600
Title of 12(b) Security	Common Stock $0.01 Par Value
Trading Symbol	INVA
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1,006,059,818
Entity Common Stock, Shares Outstanding		101,300,967
Entity Central Index Key	0001080014
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	true
Amendment Description	This Amendment No. 1 on Form 10-K/A (the "Amendment") amends the Annual Report on Form 10-K of Innoviva, Inc. (the "Company") for the year ended December 31, 2019, originally filed on February 19, 2020 (the "Original Filing"). The Company is filing the Amendment primarily to provide an amended report of Grant Thornton LLP's audit report due to an inadvertent omission of the auditor tenure statement in the Report of Independent Registered Public Accounting Firm contained in Part II, Item 8 of the Original Filing. In accordance with applicable Securities and Exchange Commission ("SEC") rules and as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, Amendment No. 1 includes new certifications from the Company's Principal Executive Officer and Principal Financial Officer dated as of the date of filing of Amendment No. 1. This Amendment No. 1 consists solely of the preceding cover page, this explanatory note, Part II., Item 8., "Financial Statements and Supplementary Data," in its entirety, Part IV., Item 15., "Exhibits and Financial Statement Schedules," in its entirety, the signature page, and the new certifications from the Company's Principal Executive Officer and Principal Financial Officer. Amendment No. 1 does not amend or update in any way the disclosures made in the Original Filing, except as described above. Amendment No. 1 should be read in conjunction with the Original Filing and with the Company's subsequent filings with the SEC.