v3.7.0.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2017
May 01, 2017
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q1  
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  
American Depositary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   269,557,267
Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,734,335