v3.5.0.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2016
Aug. 01, 2016
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2  
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   1,836,886
American Depository Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   183,448,877