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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Feb. 15, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name TransMedics Group, Inc.    
Entity Central Index Key 0001756262    
Current Fiscal Year End Date --12-31    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Public Float     $ 857.8
Entity Common Stock, Shares Outstanding   27,961,954  
Entity File Number 001-38891    
Entity Incorporation, State or Country Code MA    
Entity Tax Identification Number 83-2181531    
Entity Address, Address Line One 200 Minuteman Road    
Entity Address, City or Town Andover    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01810    
City Area Code 978    
Local Phone Number 552-0900    
ICFR Auditor Attestation Flag true    
Document Annual Report true    
Document Transition Report false    
Title of 12(b) Security Common Stock, No Par Value    
Trading Symbol TMDX    
Security Exchange Name NASDAQ    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Firm ID 238    
Auditor Location Boston, Massachusetts    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Definitive Proxy Statement for its 2022 Annual Meeting of Stockholders scheduled to be held on June 1, 2022, which Definitive Proxy will be filed with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year end of December 31, 2021 are incorporated by reference into Part II and Part III of this Form 10-K.