Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v3.22.1
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 23, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
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 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    
Entity Shell Company false    
Entity Central Index Key 0001651407    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Public Float     $ 184,715,964
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
IcfrAuditorAttestationFlag false    
Auditor Name BDO USA, LLP    
Auditor Firm ID 243    
Auditor Location New York    
Class A Common Shares      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   7,000,000  
Common Shares      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   83,590,092