v3.19.3
Cover - shares
9 Months Ended
Sep. 30, 2019
Nov. 11, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2019  
Document Transition Report false  
Entity File Number 000-52170  
Entity Registrant Name INNERWORKINGS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-5997364  
Entity Address, Address Line One 203 North LaSalle Street  
Entity Address, Address Line Two Suite 1800  
Entity Address, City or Town Chicago  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60601  
City Area Code (312)  
Local Phone Number 642-3700  
Title of 12(b) Security Common Stock, $0.0001 par value  
Trading Symbol INWK  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   52,132,517
Entity Central Index Key 0001350381  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2019