Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2017
Feb. 22, 2018
Jun. 30, 2017
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Entity Registrant Name CHIMERIX INC    
Entity Central Index Key 0001117480    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 151,017,173
Entity Common Stock, Shares Outstanding   47,652,332