v3.8.0.1
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Document and Entity Information [Abstract]    
Entity Registrant Name INTERCEPT PHARMACEUTICALS INC  
Entity Central Index Key 0001270073  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Trading Symbol icpt  
Entity Common Stock, Shares Outstanding 25,172,678  
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2017  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2017  
Entity Well-Known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Public Float   $ 8,888,156