Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2023
Jun. 30, 2022
Document Information        
Document Type 10-K      
Document Annual Report true      
Document Period End Date Dec. 31, 2022      
Document Transition Report false      
Entity File Number 001-38128      
Entity Registrant Name Checkpoint Therapeutics, Inc.      
Entity Incorporation, State or Country Code DE      
Entity Tax Identification Number 47-2568632      
Entity Address, Address Line One 95 Sawyer Road      
Entity Address, Address Line Two Suite 110      
Entity Address, City or Town Waltham      
Entity Address, State or Province MA      
Entity Address, Postal Zip Code 02453      
City Area Code 781      
Local Phone Number 652-4500      
Title of 12(b) Security Common Stock, par value $0.0001 per      
Trading Symbol CKPT      
Security Exchange Name NASDAQ      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Interactive Data Current Yes      
Entity Filer Category Non-accelerated Filer      
Entity Small Business true      
Entity Emerging Growth Company true      
Entity Ex Transition Period true      
ICFR Auditor Attestation Flag false      
Entity Shell Company false      
Entity Public Float       $ 71,439,791
Entity Central Index Key 0001651407      
Current Fiscal Year End Date --12-31      
Document Fiscal Year Focus 2022      
Document Fiscal Period Focus FY      
Amendment Flag false      
Auditor Name KPMG, LLP BDO USA, LLP    
Auditor Location Boston, MA New York, NY    
Auditor Firm ID 185 243    
Common Class A [Member]        
Document Information        
Entity Common Stock, Shares Outstanding     700,000  
Common Stock [Member]        
Document Information        
Entity Common Stock, Shares Outstanding     0