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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 27, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-39264    
Entity Registrant Name KEROS THERAPEUTICS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 81-1173868    
Entity Address, Address Line One 1050 Waltham Street,    
Entity Address, Address Line Two Suite 302    
Entity Address, City or Town Lexington,    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02421    
City Area Code 617    
Local Phone Number 314-6297    
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 false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 453.0
Entity Common Stock, Shares Outstanding (in shares)   19,717,533  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A in connection with the registrant’s 2026 Annual Meeting of Stockholders, which will be filed subsequent to the date hereof, are incorporated by reference into Part III of this Form 10-K. Such proxy statement will be filed with the Securities and Exchange Commission not later than 120 days following the end of the registrant’s fiscal year ended December 31, 2025.
    
Entity Central Index Key 0001664710    
Amendment Flag false    
Document Fiscal Year Period FY    
Document Fiscal Year Focus 2025    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, $0.0001 par value per share    
Trading Symbol KROS    
Security Exchange Name NASDAQ    
Preferred Stock      
Document Information [Line Items]      
Title of 12(b) Security Preferred Share Purchase Rights    
Security Exchange Name NASDAQ    
No Trading Symbol Flag true