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Leases - Additional Information (Detail) $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2020 | Aug. 15, 2019 USD ($) RenewalOption | Jul. 04, 2019 | Apr. 12, 2019 | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 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 |  |  |  |  | $ 1,475 |  | $ 1,475 |  |
Monthly rent payment |  |  |  |  | 18,126 |  | 18,126 |  |
Operating lease liability |  |  |  |  | 10,600 |  | 10,600 |  | $ 9,800
Operating lease right-of-use asset |  |  |  |  | 8,149 |  | 8,149 |  | $ 8,511
Operating lease expense |  |  |  |  | $ 400 | $ 400 | $ 1,200 | $ 1,100 |
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 was scheduled to terminate on September 30, 2020 and was extended for one additional year through April 30, 2021 and can be extended automatically for successive one year periods. On August 1, 2020 the Company entered into an Office Centre Sharing Agreement effective September 14, 2020 for office space in Dublin, Ireland which terminates on April 30, 2021 and can be extended automatically for successive one year periods. |  |
Operating lease, expiration date | Apr. 30, 2021 |  | 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 was scheduled to terminate on September 30, 2020 and was extended for one additional year through April 30, 2021 and can be extended automatically for successive one year periods. On August 1, 2020 the Company entered into an Office Centre Sharing Agreement effective September 14, 2020 for office space in Dublin, Ireland which terminates on April 30, 2021 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 |  |

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