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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Apr. 27, 2023
Jun. 30, 2022
Cover Page [Line Items]      
Document Type 10-K/A    
Amendment Flag true    
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 Tax Identification Number 00-0000000    
Entity Address, Address Line One Iconic Offices, The Greenway    
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 ADS representing the right to receive one (1) Ordinary Share of Amarin Corporation plc    
Name of each exchange on which registered NASDAQ    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
None.
   
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Iselin, New Jersey    
Amendment Description Amarin Corporation plc is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to its Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the “Original Form 10-K Filing”), which was originally filed with the Securities and Exchange Commission (the “SEC”) on March 1, 2023, solely to set forth information required by Items 10, 11, 12, 13 and 14 of Part III of Form 10-K. This information was previously omitted from the Original Form 10-K Filing in reliance on General Instruction G.3. to Form 10-K, which permits the above referenced Items to be incorporated in an Annual Report on Form 10-K by reference from a definitive proxy statement which involves the election of directors, if such definitive proxy statement is filed with the SEC no later than 120 days after the end of the fiscal year covered by the Form 10-K. We are filing this Amendment to include the Part III information in our Annual Report on Form 10-K because we no longer intend to file a definitive proxy statement for our annual meeting of shareholders within 120 days after the end of our fiscal year ended December 31, 2022. Accordingly, this Amendment amends and restates in its entirety Items 10, 11, 12, 13 and 14 of Part III of the Original Form 10-K Filing, and the reference on the cover of the Original Form 10-K Filing to the incorporation by reference to portions of our definitive proxy statement into Part III of the Original Form 10-K Filing are hereby deleted. In addition, pursuant to the rules of the SEC, Item 15 of Part IV of the Original Form 10-K Filing is hereby amended solely to include, as Exhibits 31.3 and 31.4, new certifications of our principal executive officer and principal financial officer pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Because no financial statements are included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of such certifications have been omitted. We are not including new certifications required by Rule 13a-14(b) under the Exchange Act as no financial statements are included in this Amendment. Except as described above, no other changes have been made to the Original Form 10-K Filing. The Original Form 10-K Filing continues to speak as of the date of the Original Form 10-K Filing, and we have not updated the disclosures contained therein to reflect any events that have occurred as of a date subsequent to the date of the Original Form 10-K Filing. Accordingly, this Amendment should be read in conjunction with the Original Form 10-K Filing and our other filings made with the SEC subsequent to the filing of the Original Form 10-K Filing. References in this Amendment to “Amarin,” the “Company,” “we,” “our” and “us” refer to Amarin Corporation plc and its subsidiaries, on a consolidated basis, unless otherwise indicated.    
American Depositary Shares      
Cover Page [Line Items]      
Entity Common Stock, Shares Outstanding   387,307,491  
Ordinary Shares      
Cover Page [Line Items]      
Entity Common Stock, Shares Outstanding   20,338,464