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Equity - Preferred Stock - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 29, 2018
shares
Feb. 01, 2018
shares
Mar. 05, 2015
USD ($)
shares
Mar. 31, 2018
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2019
£ / shares
shares
Dec. 31, 2018
£ / shares
shares
Dec. 31, 2015
shares
Jun. 30, 2019
$ / shares
shares
Mar. 05, 2015
£ / shares
shares
Mar. 05, 2015
$ / shares
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 | $       $ 70,007,000                
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                     0.1 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             28,931,746 28,931,746   28,931,746    
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%                  
Ordinary Shares                        
Stockholders Equity Note [Line Items]                        
Convertible senior notes, total ADS into which the debt is exchangeable               3,886,718 6,283,333      
Preferred stock, equivalent ordinary shares upon future consolidation outstanding               28,931,746        
American Depositary Shares                        
Stockholders Equity Note [Line Items]                        
Issuance of stock (shares) 11,111,112 19,178,082                    
American Depositary Shares | Series A Preferred Stock                        
Stockholders Equity Note [Line Items]                        
Issuance of stock (shares)     352,150,790                  
Stock issued under private placement, value | $     $ 52,800,000                  
Preferred Shares Basis                        
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