Document and Entity Information
12 Months Ended
Dec. 31, 2018
Document and Entity Information [Abstract]  
Entity Registrant Name International Money Express, Inc.
Entity Central Index Key 0001683695
Entity Filer Category Non-accelerated Filer
Entity Small Business false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Document Type S-4
Amendment Flag false
Document Period End Date Dec. 31, 2018