v3.6.0.2
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2016
Feb. 20, 2017
Jun. 30, 2016
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Trading Symbol AMRN    
Entity Registrant Name AMARIN CORP PLC\UK    
Entity Central Index Key 0000897448    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 381,800,000
American Depositary Shares      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   269,369,455  
Ordinary Shares      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   2,692,102