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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Feb. 24, 2023
Jun. 30, 2022
Document And Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
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 Interactive Data Current Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Small Business false    
Entity Public Float     $ 721.2
Entity File Number 0-21392    
Entity Incorporation, State or Country Code X0    
Entity Address, Address Line One Iconic Offices, The Greenway    
Entity Tax Identification Number 00-0000000    
Entity Address, Address Line Two Block C Ardilaun Court    
Entity Address, Address Line Three 112-114 St Stephens Green    
Entity Address, City or Town Dublin    
Entity Address, Postal Zip Code 2    
Entity Address, Country IE    
City Area Code 353 (0) 1    
Local Phone Number 6699 020    
Document Annual Report true    
Document Transition Report false    
Title of each class American Depositary Shares (ADS(s)), each ADSrepresenting the right to receive one (1) Ordinary Share ofAmarin Corporation plc    
Name of each exchange on which registered NASDAQ    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Certain information required to be disclosed in Part III of this Annual Report on Form 10-K is incorporated by reference from the registrant’s definitive proxy statement to be filed not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

   
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location Iselin, New Jersey    
American Depositary Shares      
Document And Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   385,785,809  
Ordinary Shares      
Document And Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   20,329,912