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Leases - Additional Information (Detail) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 15, 2019 USD ($) RenewalOption | Jul. 04, 2019 | Apr. 12, 2019 | Jan. 26, 2019 | Jul. 01, 2011 | Sep. 30, 2019 USD ($) | Sep. 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%
Monthly rent payment |  |  |  |  |  | $ 18,223 | $ 18,223
Operating lease liability |  |  |  |  |  | 9,556 | 9,556
Operating lease right-of-use asset |  |  |  |  |  | 8,633 | 8,633
Operating lease expense |  |  |  |  |  | $ 400 | $ 1,100
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 | 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

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