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Leases - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Aug. 15, 2019
USD ($)
RenewalOption
Jul. 04, 2019
Apr. 12, 2019
Jan. 26, 2019
Jul. 01, 2011
Dec. 31, 2019
USD ($)
Lessee Lease Description [Line Items]            
Incremental borrowing rate for purposes of calculation of lease liabilities           11.50%
Change in incremental borrowing rate           1.00%
Monthly rent payment           $ 18,223
Operating lease liability           9,833
Operating lease right-of-use asset           8,511
Operating lease expense           $ 1,500
Dublin | Office Centre Sharing Agreements            
Lessee Lease Description [Line Items]            
Description of lease agreement           On April 12, 2019 and July 4, 2019, the Company entered into Office Centre Sharing Agreements effective May 1, 2019 and October 1, 2019, respectively, to replace the office space with new office space in Dublin, Ireland which terminates on April 30, 2020 and September 30, 2020, respectively, and can be extended automatically for successive one year periods.
Lease termination existence of option to extend           true
Lease renewal term           1 year
Operating lease, option to extend           can be extended automatically for successive one year periods
Operating lease, existence of option to extend [true false]           true
Dublin | Office Centre Sharing Agreements Effective May 1, 2019            
Lessee Lease Description [Line Items]            
Operating lease, expiration date     Apr. 30, 2020      
Dublin | Office Centre Sharing Agreements Effective October 1, 2019            
Lessee Lease Description [Line Items]            
Operating lease, expiration date   Sep. 30, 2020        
Bedminster            
Lessee Lease Description [Line Items]            
Operating lease, expiration date       Sep. 15, 2019 Sep. 15, 2019  
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 termination existence of option to extend true          
Lease renewal term 5 years          
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