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Leases - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Aug. 15, 2019
USD ($)
RenewalOption
Jul. 04, 2019
Apr. 12, 2019
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Lessee Lease Description [Line Items]                
Incremental borrowing rate for purposes of calculation of lease liabilities       11.50%   11.50%    
Change in incremental borrowing rate           1.00%    
Short-term lease payments       $ 1,495   $ 1,495    
Monthly rent payment       18,223   18,223    
Operating lease liability       10,400   10,400   $ 9,800
Operating lease right-of-use asset       8,291   8,291   $ 8,511
Operating lease expense       $ 400 $ 400 $ 800 $ 700  
Dublin | Office Centre Sharing Agreements                
Lessee Lease Description [Line Items]                
Description of lease agreement           On April 12, 2019 the Company entered into an Office Centre Sharing Agreement for office space in Dublin, Ireland effective May 1, 2019 was scheduled to terminate on April 30, 2020 and was extended for one additional year through April 30, 2021 and can continue to be extended automatically for successive one year periods. On July 4, 2019, the Company entered into an Office Centre Sharing Agreements effective October 1, 2019 for office space in Dublin, Ireland which terminates on September 30, 2020 and can be extended automatically for successive one year periods.    
Operating lease, expiration date   Sep. 30, 2020 Apr. 30, 2020          
Lease renewal term       1 year   1 year    
Operating lease, option to additional extend           extended for one additional year through April 30, 2021 and can continue to be extended automatically for successive one year periods    
Lease termination existence of option to extend           true    
Operating lease, existence of option to extend [true false]           true    
Operating lease, option to extend           On July 4, 2019, the Company entered into an Office Centre Sharing Agreements effective October 1, 2019 for office space in Dublin, Ireland which terminates on September 30, 2020 and can be extended automatically for successive one year periods.    
Short-term lease payments       $ 100   $ 100    
Dublin | Office Centre Sharing Agreements Effective May 1, 2019                
Lessee Lease Description [Line Items]                
Operating lease, expiration date     Apr. 30, 2021          
Bridgewater                
Lessee Lease Description [Line Items]                
Description of lease agreement           Amarin will have a one-time option to terminate the agreement effective on the first day of the ninety-seventh month after the Commencement Date upon advance written notice and a termination payment specified in the Lease.    
Lease renewal term 5 years              
Lease termination existence of option to extend true              
Lease commencement date Aug. 15, 2019              
Lease agreement term 11 years              
Number of renewal options | RenewalOption 2              
Lease termination description           one-time option to terminate the agreement effective on the first day of the ninety-seventh month after the Commencement Date    
Monthly rent payment $ 100              
Maximum                
Lessee Lease Description [Line Items]                
Short term lease period           12 months