XML 55 R1.htm IDEA: XBRL DOCUMENT v3.19.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2019
Nov. 01, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2019  
Entity Registrant Name resTORbio, Inc.  
Entity Central Index Key 0001720580  
Trading Symbol TORC  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity File Number 001-38359  
Entity Tax Identification Number 81-3305277  
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  
Entity Address, Postal Zip Code 02116  
City Area Code (857)  
Local Phone Number 315-5528  
Entity Common Stock, Shares Outstanding   36,443,631
Security Exchange Name NASDAQ  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Document Quarterly Report true  
Document Transition Report false