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Equity - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 11, 2016
shares
Feb. 01, 2016
shares
Jul. 10, 2015
USD ($)
$ / shares
shares
Jul. 06, 2015
shares
Mar. 30, 2015
USD ($)
Mar. 05, 2015
USD ($)
$ / shares
shares
Jan. 29, 2015
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Aug. 31, 2016
USD ($)
$ / shares
shares
Nov. 30, 2015
USD ($)
May 31, 2014
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
shares
Mar. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2016
£ / shares
shares
Dec. 31, 2015
£ / shares
shares
Mar. 05, 2015
£ / shares
Stockholders Equity Note [Line Items]                                        
Convertible senior notes, principal amount | $                               $ 128,115        
Net proceeds from public offering | $                               64,614        
Preferred stock, par value | £ / shares                                   £ 0.05 £ 0.05  
Private placement, closing date           Mar. 30, 2015                            
Stock issued under private placement, value | $                               $ 64,614        
Aggregate gross proceeds | $                             $ 52,800          
Estimated offering expense | $                             $ 700          
Common stock, par value | £ / shares                                   £ 0.50 £ 0.50 £ 0.50
Number of shares issued for each preference shares           0.1                            
Preferred stock, equivalent ordinary shares upon future consolidation outstanding               32,818,464       32,818,464       32,818,464   32,818,464 32,818,464  
Market value, per share | $ / shares           $ 2.39                            
BCF resulting from issuance of Series A Preference Shares | $                         $ 1,646 $ 31,300     $ 32,987      
Transfer derivative liability to equity | $                                 $ 1,814      
Stock options, outstanding               21,240,894       21,240,894       21,240,894   21,240,894    
Restricted stock units, outstanding               10,346,162       10,346,162       10,346,162   10,346,162    
Shares issued, exercise of stock options                               94,272 18,020      
Proceeds from exercise of stock options, net of transaction costs | $                               $ 136 $ 31      
Shares issued, exercise of warrants                                 1,844,585      
Proceeds from exercise of warrants, gross of transaction costs | $                                 $ 2,800      
Proceeds from exercise of warrants, net of transaction costs | $                                 2,713      
Warrants outstanding               0       0       0   0    
Preferred Stock Purchase Option                                        
Stockholders Equity Note [Line Items]                                        
Derivative liability at fair value | $           $ 900                            
Transfer derivative liability to equity | $                                 $ 1,814      
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        
Preferred stock, par value | £ / shares                                       £ 0.05
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]                                        
Exchange of exchangeable senior notes, net of transaction costs (shares)                           6,283,333            
Preferred stock, equivalent ordinary shares upon future consolidation outstanding               32,818,464       32,818,464       32,818,464   32,818,464    
American Depositary Shares                                        
Stockholders Equity Note [Line Items]                                        
Additional shares to be issued                               24,265,000        
Net proceeds from public offering | $                               $ 64,614        
Second Private Placement | Preferred Stock Purchase Option                                        
Stockholders Equity Note [Line Items]                                        
BCF resulting from issuance of Series A Preference Shares | $                         3,400              
Derivative liability at fair value | $         $ 1,800 $ 900                            
Gain (loss) on change in fair value of derivatives | $           $ (900)             $ (1,600)              
Transfer derivative liability to equity | $         $ 1,800                              
Second Private Placement | Series A Preferred Stock                                        
Stockholders Equity Note [Line Items]                                        
Preferred stock, equivalent ordinary shares upon future consolidation outstanding     3,886,718                                  
Convertible Debt                                        
Stockholders Equity Note [Line Items]                                        
Convertible senior notes, principal amount | $                               $ 150,000        
Convertible Debt | American Depositary Shares                                        
Stockholders Equity Note [Line Items]                                        
Exchange of exchangeable senior notes, net of transaction costs (shares)                               60,311,188        
Convertible Debt | 2014 Notes                                        
Stockholders Equity Note [Line Items]                                        
Convertible senior notes, principal amount | $               $ 118,700     $ 118,700 $ 118,700                
Derivative liability at fair value | $                     $ 3,500                  
Convertible Debt | 2015 Notes                                        
Stockholders Equity Note [Line Items]                                        
Convertible senior notes, principal amount | $                   $ 31,300   $ 31,300                
Derivative liability at fair value | $                   $ 500                    
Final As-Adjusted | Convertible Debt | 2014 Notes | American Depositary Shares                                        
Stockholders Equity Note [Line Items]                                        
Exchange of exchangeable senior notes, net of transaction costs (shares)                       47,739,925                
Final As-Adjusted | Convertible Debt | 2015 Notes | American Depositary Shares                                        
Stockholders Equity Note [Line Items]                                        
Exchange of exchangeable senior notes, net of transaction costs (shares)                       12,571,263                
American Depositary Shares                                        
Stockholders Equity Note [Line Items]                                        
Additional shares to be issued                 21,100,000                      
Over allotment option, exercisable period                 30 days                      
Sale of stock price per share | $ / shares                 $ 2.679                      
Net proceeds from public offering | $                 $ 64,600                      
American Depositary Shares | Series A Preferred Stock                                        
Stockholders Equity Note [Line Items]                                        
Additional shares to be issued           352,150,790                            
Stock issued under private placement, value | $           $ 52,800                            
American Depositary Shares | Second Private Placement | Series A Preferred Stock                                        
Stockholders Equity Note [Line Items]                                        
Additional shares to be issued     38,867,180                                  
Stock issued under private placement, value | $     $ 5,800                                  
American Depositary Shares | Over-Allotment Option                                        
Stockholders Equity Note [Line Items]                                        
Additional shares to be issued                 3,165,000                      
Preferred Shares Basis                                        
Stockholders Equity Note [Line Items]                                        
Share conversion price | $ / shares           $ 0.15                            
Preferred Shares Basis | Second Private Placement | Series A Preferred Stock                                        
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       $ 1.50       $ 1.50        
Ordinary Shares Basis | Second Private Placement | Series A Preferred Stock                                        
Stockholders Equity Note [Line Items]                                        
Share conversion price | $ / shares     $ 1.50                                  
Stock Options                                        
Stockholders Equity Note [Line Items]                                        
Percentage of outstanding shares on a fully diluted basis               6.00%       6.00%       6.00%   6.00%    
Stock Options | Stock Incentive Plan 2011                                        
Stockholders Equity Note [Line Items]                                        
Stock options, Granted 208,340 2,442,000   5,470,000     1,622,500                          
Stock units, Vesting Period   4 years         4 years                          
Stock Options | Stock Incentive Plan 2011 | Vest over a four year period                                        
Stockholders Equity Note [Line Items]                                        
Stock options, Granted       3,670,000                                
Stock units, Vesting Period       4 years                                
Stock Options | Stock Incentive Plan 2011 | Director                                        
Stockholders Equity Note [Line Items]                                        
Stock options, Granted       288,657                                
Stock Options | Stock Incentive Plan 2011 | Director | Vest in equal installments over a three year period                                        
Stockholders Equity Note [Line Items]                                        
Stock options, Granted       121,506                                
Stock units, Vesting Period       3 years                                
Stock Options | Stock Incentive Plan 2011 | Director | Vest in full                                        
Stockholders Equity Note [Line Items]                                        
Stock options, Granted       167,151                                
Restricted Stock Units (RSUs)                                        
Stockholders Equity Note [Line Items]                                        
Percentage of outstanding shares on a fully diluted basis               3.00%       3.00%       3.00%   3.00%    
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011                                        
Stockholders Equity Note [Line Items]                                        
Stock units, Granted 148,403 1,607,500   1,455,000     2,564,251                          
Stock units, Vesting Period 3 years 3 years   4 years     3 years                          
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Vest over a four year period                                        
Stockholders Equity Note [Line Items]                                        
Shares issued, related to the vesting of RSUs                               272,812        
Treasury shares for settlement of employee tax obligations                               125,484        
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Vest in equal installments over a three year period                                        
Stockholders Equity Note [Line Items]                                        
Shares issued, related to the vesting of RSUs                               818,352        
Treasury shares for settlement of employee tax obligations                               270,329        
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Director                                        
Stockholders Equity Note [Line Items]                                        
Stock units, Granted       413,500                                
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Director | Vest in equal installments over a three year period                                        
Stockholders Equity Note [Line Items]                                        
Stock units, Granted       283,500                                
Stock units, Vesting Period       3 years                                
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Director | Vest in full                                        
Stockholders Equity Note [Line Items]                                        
Stock units, Granted       130,000                                
Performance Based Options | Stock Incentive Plan 2011 | Vest upon the achievement of certain performance conditions                                        
Stockholders Equity Note [Line Items]                                        
Stock options, Granted       1,800,000                                
Performance Based Restricted Stock Unit | Stock Incentive Plan 2011                                        
Stockholders Equity Note [Line Items]                                        
Stock units, Granted             5,455,500