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Document and Entity Information
Aug. 12, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 12, 2021
Entity Registrant Name Repare Therapeutics Inc.
Entity Central Index Key 0001808158
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity File Number 001-39335
Entity Incorporation, State or Country Code A8
Entity Tax Identification Number 00-0000000
Entity Address, Address Line One 7210 Frederick-Banting
Entity Address, Address Line Two Suite 100
Entity Address, City or Town St-Laurent
Entity Address, State or Province QC
Entity Address, Country CA
Entity Address, Postal Zip Code H4S 2A1
City Area Code 857
Local Phone Number 412-7018
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common shares, no par value
Trading Symbol RPTX
Security Exchange Name NASDAQ