Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v3.20.1
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Mar. 06, 2020
Jun. 28, 2019
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name Checkpoint Therapeutics, Inc.    
Entity Central Index Key 0001651407    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
Entity Small Business true    
Trading Symbol CKPT    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Entity Public Float     $ 68,543,036
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   48,038,506  
Common Class A [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   7,000,000