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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 04, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Trading Symbol TCRX    
Entity Registrant Name TSCAN THERAPEUTICS, INC.    
Entity Central Index Key 0001783328    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-40603    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 82-5282075    
Entity Address, Address Line One 830 Winter Street    
Entity Address, State or Province MA    
Entity Address, City or Town Waltham    
Entity Address, Postal Zip Code 02451c    
City Area Code 857    
Local Phone Number 399-9500    
Title of 12(b) Security Voting Common Stock, $0.0001 par value per share    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
ICFR Auditor Attestation Flag false    
Entity Common Stock, Shares Outstanding   23,976,942  
Entity Public Float     $ 0
Auditor Name Deloitte & Touche LLP    
Auditor Location Boston, Massachusetts    
Auditor Firm ID 34    
Documents Incorporated by Reference [Text Block]

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s proxy statement for the 2022 annual meeting of stockholders to be filed pursuant to Regulation 14A within 120 days after the registrant’s fiscal year ended December 31, 2021, are incorporated by reference in Part III of this Form 10-K