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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2022
Mar. 20, 2023
Jun. 30, 2022
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2022    
Entity File Number 001-40886    
Entity Registrant Name COGNITION THERAPEUTICS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-4365359    
Entity Address, Address Line One 2500 Westchester Ave.    
Entity Address, City or Town Purchase    
Entity Address State Or Province NY    
Entity Address, Postal Zip Code 10577    
City Area Code 412    
Local Phone Number 481-2210    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol CGTX    
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 false    
Entity Shell Company false    
Entity Public Float     $ 38,225,874
Entity Common Stock, Shares Outstanding   29,262,587  
Entity Central Index Key 0001455365    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Philadelphia, PA