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Leases - Additional Information (Detail) $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 15, 2019 USD ($) RenewalOption | Jul. 04, 2019 | Apr. 12, 2019 | Jan. 26, 2019 | Jul. 01, 2011 | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($)
Lessee Lease Description [Line Items] |  |  |  |  |  |  |
Incremental borrowing rate for purposes of calculation of lease liabilities |  |  |  |  |  | 11.50% | 11.50%
Change in incremental borrwing rate |  |  |  |  |  |  | 1.00%
Short-term lease commited aggregate payment amount |  |  |  |  |  | $ 200 | $ 200
Monthly rent payment |  |  |  |  |  | 18,224 | 18,224
Operating lease liability |  |  |  |  |  | 9,300 | 9,300
Current operating lease liability |  |  |  |  |  | $ 1,126 | $ 1,126
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] |  |  |  |  |  | amrn:AccruedLiabilitiesAndOtherLiabilitiesCurrent | amrn:AccruedLiabilitiesAndOtherLiabilitiesCurrent
Operating lease right-of-use asset |  |  |  |  |  | $ 8,762 | $ 8,762
Operating lease expense |  |  |  |  |  | $ 400 | $ 700
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 terminate 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 | 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 description |  |  |  |  |  |  | one-time option to terminate the agreement effective on the first day of the ninety-seventh month after the Commencement Date
Bridgewater | Scenario Forecast |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |
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 |  |  |  |  |  |
Monthly rent payment | $ 100 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |
Short term lease period |  |  |  |  |  |  | 12 months

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