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Cover
Aug. 31, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 31, 2022
Entity File Number 001-33287
Entity Registrant Name Information Services Group, Inc.
Entity Central Index Key 0001371489
Entity Tax Identification Number 20-5261587
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 2187 Atlantic Street
Entity Address, City or Town Stamford
Entity Address, State or Province CT
Entity Address, Postal Zip Code 06902
City Area Code 203
Local Phone Number 517-3100
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Shares of Common Stock, $0.001 par value
Trading Symbol III
Security Exchange Name NASDAQ
Entity Emerging Growth Company false