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Equity - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jul. 10, 2015
USD ($)
$ / shares
shares
Jul. 06, 2015
shares
Mar. 05, 2015
USD ($)
$ / shares
shares
Jan. 29, 2015
shares
Mar. 11, 2014
shares
Jan. 08, 2014
shares
Nov. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2015
£ / shares
Mar. 05, 2015
£ / shares
Dec. 31, 2014
£ / shares
shares
Stockholders Equity Note [Line Items]                          
Shares issued, exercise of warrants               1,844,585 1,684,888        
Proceeds from exercise of warrants, gross of transaction costs | $               $ 2,800 $ 1,700        
Proceeds from exercise of warrants, net of transaction costs | $               $ 2,713 $ 1,651 $ 160      
Warrants outstanding               0          
Stock options, outstanding               17,818,053         10,670,000
Restricted stock units, outstanding               10,886,523          
Shares issued, exercise of stock options               18,020 234,500        
Proceeds from exercise of stock options, net of transaction costs | $               $ 31 $ 307 627      
Refund of equity issuance costs | $                 $ 3,191        
Preferred stock, par value | £ / shares                     £ 0.05    
Private placement, closing date     Mar. 30, 2015                    
Stock issued under private placement, value | $                   $ 121,206      
Aggregate gross proceeds | $               52,800          
Estimated offering expense | $               $ 700          
Common stock, par value | £ / shares                     £ 0.50   £ 0.50
Number of shares issued for each preference shares               0.1          
Preferred stock, equivalent ordinary shares upon future consolidation               32,818,464         0
Market value, per share | $ / shares     $ 2.39                    
BCF resulting from issuance of Series A Preference Shares | $               $ 32,987          
Transfer derivative liability to equity | $               1,814          
Preferred Stock Purchase Option                          
Stockholders Equity Note [Line Items]                          
Derivative liability at fair value | $     $ 900                    
Transfer derivative liability to equity | $               $ 1,814          
Stock Incentive Plan 2011                          
Stockholders Equity Note [Line Items]                          
Shares issued, related to the vesting of RSUs               639,500          
Treasury shares for settlement of employee tax obligations               114,258          
Convertible Debt | 2015 Notes                          
Stockholders Equity Note [Line Items]                          
Derivative liability at fair value | $             $ 500            
Convertible Debt | 2015 Notes | Minimum                          
Stockholders Equity Note [Line Items]                          
Beneficial ownership limitation             4.99%            
Convertible Debt | 2015 Notes | Maximum                          
Stockholders Equity Note [Line Items]                          
Beneficial ownership limitation             19.90%            
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  
Stock issued under private placement, value | $               $ 57,853          
Ordinary Shares                          
Stockholders Equity Note [Line Items]                          
Shares issued               6,283,333          
Preferred stock, equivalent ordinary shares upon future consolidation               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          
Derivative liability at fair value | $               1,800          
Gain (loss) on change in fair value of derivatives | $               (1,600)          
Second Private Placement | Series A Preferred Stock                          
Stockholders Equity Note [Line Items]                          
Preferred stock, equivalent ordinary shares upon future consolidation 3,886,718                        
Subscription agreement to purchase Additional shares | $ $ 5,800                        
First Private Placement | Preferred Stock Purchase Option                          
Stockholders Equity Note [Line Items]                          
Derivative liability at fair value | $     $ 900                    
Gain (loss) on change in fair value of derivatives | $     (900)                    
Transfer derivative liability to equity | $               $ 1,814          
American Depository Shares                          
Stockholders Equity Note [Line Items]                          
Stock issued under private placement, value | $     $ 52,800                    
American Depository Shares | Series A Preferred Stock                          
Stockholders Equity Note [Line Items]                          
Stock issued under private placement, shares     352,150,790                    
American Depository Shares | Second Private Placement | Series A Preferred Stock                          
Stockholders Equity Note [Line Items]                          
Stock issued under private placement, shares 38,867,180                        
Ordinary Shares Basis                          
Stockholders Equity Note [Line Items]                          
Share conversion price | $ / shares               $ 1.50          
Ordinary Shares Basis | Second Private Placement | Series A Preferred Stock                          
Stockholders Equity Note [Line Items]                          
Share conversion price | $ / shares $ 1.50                        
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                        
Restricted Stock Units (RSUs)                          
Stockholders Equity Note [Line Items]                          
Percentage of outstanding shares on a fully diluted basis               7.00%          
Stock units, Granted               9,888,000 2,255,000        
Stock units, expected to vest               10,887,000   196,000     2,256,000
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011                          
Stockholders Equity Note [Line Items]                          
Stock units, Granted   1,455,000   2,564,251 173,348 2,082,000              
Stock units, Vesting Period   4 years   3 years 3 years 3 years              
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, Vesting Period   3 years                      
Stock units, expected to vest   283,500                      
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Director | Vest in full                          
Stockholders Equity Note [Line Items]                          
Stock units, expected to vest   130,000                      
Stock Options                          
Stockholders Equity Note [Line Items]                          
Percentage of outstanding shares on a fully diluted basis               4.00%          
Stock Options | Stock Incentive Plan 2011                          
Stockholders Equity Note [Line Items]                          
Granted options   5,470,000   1,622,500 205,890 2,605,500              
Stock units, Vesting Period   4 years   4 years   4 years   4 years          
Stock options, expected to vest   3,670,000                      
Stock Options | Stock Incentive Plan 2011 | Director                          
Stockholders Equity Note [Line Items]                          
Granted options   288,657                      
Stock Options | Stock Incentive Plan 2011 | Director | Vest in equal installments over a three year period                          
Stockholders Equity Note [Line Items]                          
Stock units, Vesting Period   3 years                      
Stock options, expected to vest   121,506                      
Stock Options | Stock Incentive Plan 2011 | Director | Vest in full                          
Stockholders Equity Note [Line Items]                          
Stock options, expected to vest   167,151                      
Performance Based Options | Stock Incentive Plan 2011                          
Stockholders Equity Note [Line Items]                          
Stock options, expected to vest   1,800,000                      
Shares issued, related to the vesting of RSUs               181,876          
Treasury shares for settlement of employee tax obligations               40,165          
Performance Based Restricted Stock Unit | Stock Incentive Plan 2011                          
Stockholders Equity Note [Line Items]                          
Stock units, Granted       5,455,500