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Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2021
Nov. 05, 2021
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2021  
Entity File Number 001-39712  
Entity Registrant Name OLEMA PHARMACEUTICALS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 30-0409740  
Entity Address, Address Line One 512 2nd Street, 4th Floor  
Entity Address, City or Town San Francisco  
Entity Address, Country CA  
Entity Address, Postal Zip Code 94107  
City Area Code 650  
Local Phone Number 243-5555  
Title of 12(b) Security Common Stock  
Trading Symbol OLMA  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   40,287,641
Entity Central Index Key 0001750284  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Amendment Flag false