Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.21.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2021
Aug. 04, 2021
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2021  
Document Transition Report false  
Entity File Number 1-36598  
Entity Registrant Name Cellectar Biosciences, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 04-3321804  
Entity Address, Address Line One 100 Campus Drive  
Entity Address, City or Town Florham Park  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 07932  
City Area Code 608  
Local Phone Number 441-8120  
Title of 12(b) Security Common stock, par value $0.00001  
Trading Symbol CLRB  
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   61,101,264
Entity Central Index Key 0001279704  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Amendment Flag false