XML 41 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Mar. 11, 2020
Jun. 28, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Entity Registrant Name resTORbio, Inc.    
Entity Central Index Key 0001720580    
Entity File Number 001-38359    
Trading Symbol TORC    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Public Float     $ 277.5
Entity Common Stock, Shares Outstanding   36,445,751  
Document Annual Report true    
Document Transition Report false    
Entity Tax Identification Number 81-3305277    
Entity Incorporation, State or Country Code DE    
Security Exchange Name NASDAQ    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Entity Address, Address Line One 500 Boylston Street    
Entity Address, Address Line Two 13th Floor    
Entity Address, City or Town Boston    
Entity Address, State or Province MA    
City Area Code 857    
Local Phone Number 315-5528    
Entity Address, Postal Zip Code 02116    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer