Cover - shares	3 Months Ended
	Mar. 31, 2020	Apr. 17, 2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-36841
Entity Registrant Name	Inovalon Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-1830316
Entity Address, Address Line One	4321 Collington Road,
Entity Address, City or Town	Bowie,
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	20716
City Area Code	301
Local Phone Number	809-4000
Title of 12(b) Security	Class A Common Stock, $0.000005 par value per share
Security Exchange Name	NASDAQ
Trading Symbol	INOV
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 Central Index Key	0001619954
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Class A Common
Entity Common Stock, Shares Outstanding (in shares)		76,119,253
Class B Common
Entity Common Stock, Shares Outstanding (in shares)		79,270,861