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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2021
Aug. 03, 2021
Cover    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-37939  
Document Period End Date Jun. 30, 2021  
Entity Registrant Name MARKER THERAPEUTICS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 45-4497941  
Entity Address, Address Line One 3200 Southwest Freeway  
Entity Address, Address Line Two Suite 2500  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77027  
City Area Code 713  
Local Phone Number 400-6400  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol MRKR  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   83,078,675
Entity Central Index Key 0001094038  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Amendment Flag false