Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-37986
Entity Registrant Name	INTERNATIONAL MONEY EXPRESS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-4219082
Entity Address, Address Line One	9480 South Dixie Highway
Entity Address, City or Town	Miami
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33156
City Area Code	305
Local Phone Number	671-8000
Title of 12(b) Security	Common stock ($0.0001 par value)
Trading Symbol	IMXI
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	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		38,593,052
Entity Central Index Key	0001683695
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2