v3.25.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 01, 2025
Document Information:    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-39413  
Entity Registrant Name Vertex, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 23-2081753  
Entity Address, Address Line One 2301 Renaissance Blvd  
Entity Address, City or Town King of Prussia  
Entity Address State Or Province PA  
Entity Address, Postal Zip Code 19406  
City Area Code 800  
Local Phone Number 355-3500  
Title of 12(b) Security Class A Common Stock, Par Value $0.001 Per Share  
Trading Symbol VERX  
Security Exchange Name NASDAQ  
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 0001806837  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Class A    
Document Information:    
Entity Common Stock, Shares Outstanding   77,318,571
Class B    
Document Information:    
Entity Common Stock, Shares Outstanding   82,155,641