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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2018
Feb. 07, 2019
Jun. 30, 2018
Document and Entity Information      
Entity Registrant Name INCYTE CORP    
Entity Central Index Key 0000879169    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 11.9
Entity Common Stock, Shares Outstanding   214,048,325  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY