v3.25.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2025
Apr. 30, 2025
Document And Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2025  
Document Fiscal Year Focus 2025  
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  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity File Number 000-21392  
Entity Incorporation, State or Country Code X0  
Entity Address, Address Line One 8th Floor  
Entity Address, Address Line Two One Central Plaza  
Entity Address, Address Line Three Dame Street  
Entity Address, City or Town Dublin  
Entity Address, Postal Zip Code D02 K7K5  
Entity Address, Country IE  
City Area Code 353 (0) 1  
Local Phone Number 6699 020  
Document Quarterly Report true  
Document Transition Report false  
Title of each class American Depositary Shares (ADS(s)), each ADSrepresenting the right to receive twenty (20) Ordinary Shares of Amarin Corporation plc  
Name of each exchange on which registered NASDAQ  
Entity Tax Identification Number 00-0000000  
American Depositary Shares    
Document And Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   20,269,174
Ordinary Shares    
Document And Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   414,140,237