v3.5.0.2
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2016
Nov. 01, 2016
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q3  
Trading Symbol AMRN  
Entity Registrant Name AMARIN CORP PLC\UK  
Entity Central Index Key 0000897448  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   1,884,965
American Depositary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   268,067,924