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Equity - Preferred Stock - Additional Information (Detail)
 3 Months Ended 12 Months Ended
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, 2018
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2018
£ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
£ / 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               $ 264,840,000 $ 64,613,000          
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 32,818,464  
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]                            
Convertible senior notes, total ADS into which the debt is exchangeable | shares               3,886,718   6,283,333        
Preferred stock, equivalent ordinary shares upon future consolidation outstanding | shares                     28,931,746 28,931,746    
American Depositary Shares                            
Stockholders Equity Note [Line Items]                            
Issuance of stock (shares) | shares 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