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Equity - Preferred Stock - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Jul. 18, 2019
shares
Nov. 29, 2018
shares
Feb. 01, 2018
shares
Jul. 10, 2015
$ / shares
shares
Mar. 30, 2015
USD ($)
Mar. 05, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2019
£ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
£ / shares
shares
Mar. 05, 2015
£ / shares
Stockholders Equity Note [Line Items]                              
Preferred stock, par value | £ / shares                       £ 0.05   £ 0.05 £ 0.05
Private placement, closing date           Mar. 30, 2015                  
Stock issued under private placement, value                 $ 440,108,000 $ 264,840,000          
Aggregate gross proceeds               $ 52,800,000              
Estimated offering expense               $ 700,000              
Common stock, par value | £ / shares                       £ 0.50   £ 0.50 £ 0.50
Number of shares issued for each preference shares | shares           0.1                  
Market value, per share | $ / shares           $ 2.39                  
BCF resulting from issuance of Series A Preference Shares             $ 31,300,000                
Preferred stock, equivalent ordinary shares upon future consolidation outstanding | shares                       28,931,746 28,931,746 28,931,746  
Second Private Placement | Preferred Stock Purchase Option                              
Stockholders Equity Note [Line Items]                              
BCF resulting from issuance of Series A Preference Shares                     $ 3,400,000        
Derivative liability at fair value         $ 1,800,000 $ 900,000                  
Gain (loss) on change in fair value of derivatives           $ (900,000)         $ (1,600,000)        
Transfer derivative liability to equity         1,800,000                    
Series A Preferred Stock                              
Stockholders Equity Note [Line Items]                              
American depositary shares conversion rate to preference shares                 American Depositary Shares, each representing one (1) share of Amarin’s Series A Convertible Preference Shares            
Series A Preferred Stock | Minimum                              
Stockholders Equity Note [Line Items]                              
Beneficial ownership limitation           4.99%                  
Series A Preferred Stock | Maximum                              
Stockholders Equity Note [Line Items]                              
Beneficial ownership limitation           19.90%                  
Series A Preferred Stock | Maximum | Second Private Placement                              
Stockholders Equity Note [Line Items]                              
Preferred stock, equivalent ordinary shares upon future consolidation outstanding | shares       3,886,718                      
Ordinary Shares                              
Stockholders Equity Note [Line Items]                              
Preferred stock, equivalent ordinary shares upon future consolidation outstanding | shares                       28,931,746 28,931,746    
Convertible senior notes, total ADS into which the debt is exchangeable | shares                   3,886,718 6,283,333        
American Depositary Shares                              
Stockholders Equity Note [Line Items]                              
Issuance of stock (shares) | shares 22,222,223 11,111,112 19,178,082                        
American Depositary Shares | Series A Preferred Stock                              
Stockholders Equity Note [Line Items]                              
Issuance of stock (shares) | shares           352,150,790                  
Stock issued under private placement, value           $ 52,800,000                  
American Depositary Shares | Series A Preferred Stock | Second Private Placement                              
Stockholders Equity Note [Line Items]                              
Issuance of stock (shares) | shares       38,867,180                      
Stock issued under private placement, value         $ 5,800,000                    
Preferred Shares Basis                              
Stockholders Equity Note [Line Items]                              
Share conversion price | $ / shares           $ 0.15                  
Preferred Shares Basis | Series A Preferred Stock | Second Private Placement                              
Stockholders Equity Note [Line Items]                              
Share conversion price | $ / shares       $ 0.15                      
Ordinary Shares Basis                              
Stockholders Equity Note [Line Items]                              
Share conversion price | $ / shares           $ 1.50             $ 1.50    
Ordinary Shares Basis | Series A Preferred Stock | Second Private Placement                              
Stockholders Equity Note [Line Items]                              
Share conversion price | $ / shares       $ 1.50