Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2020
Mar. 01, 2021
Jun. 30, 2020
Document Type 10-K    
Document Period End Date Dec. 31, 2020    
Entity Registrant Name Cellectar Biosciences, Inc.    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 32,346,423
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   50,504,064  
Entity Central Index Key 0001279704    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock [Member]      
Trading Symbol CLRB    
Title of 12(b) Security Common stock, par value $0.00001    
Security Exchange Name NASDAQ    
Warrant [Member]      
Trading Symbol CLRBZ    
Title of 12(b) Security Warrant to purchase common stock, expiring April 20, 2021    
Security Exchange Name NASDAQ