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Leases - Additional Information (Detail) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 01, 2023 USD ($) | Oct. 01, 2022 USD ($) | Feb. 01, 2022 USD ($) RenewalOption | Aug. 15, 2019 USD ($) RenewalOption | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 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% |  |
Rent payment |  |  |  |  | $ 16,808 |  |
Operating lease liability |  |  |  |  | 11,600 | $ 10,300 |
Operating lease right-of-use asset |  |  |  |  | 9,074 | 7,660 |
Operating lease expense |  |  |  |  | $ 2,800 | $ 2,200 | $ 1,600
Bridgewater |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |
Lease commencement date |  |  |  | Aug. 15, 2019 |  |  |
Lease agreement term |  |  |  | 11 years |  |  |
Number of renewal options | RenewalOption |  |  |  | 2 |  |  |
Lease renewal term |  |  |  | 5 years |  |  |
Description of lease agreement |  |  |  |  | Amarin will have a one-time option to terminate the agreement effective on the first day of the 97th 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 97th month after the Commencement Date |  |
Lease termination existence of option to extend |  |  |  | true |  |  |
Rent payment |  |  |  | $ 100 |  |  |
Bridgewater | Subsequent Event |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |
Sublease commencement date | Feb. 01, 2023 |  |  |  |  |  |
Lease agreement term | 7 years 6 months |  |  |  |  |  |
Receive rent payment | $ 100 |  |  |  |  |  |
Zug Switzerland |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |
Lease commencement date |  |  | Feb. 01, 2022 |  |  |  |
Lease agreement term |  |  | 5 years |  |  |  |
Number of renewal options | RenewalOption |  |  | 1 |  |  |  |
Lease renewal term |  |  | 5 years |  |  |  |
Rent payment |  |  | $ 200 |  |  |  |
Dublin |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |
Lease commencement date |  | Oct. 01, 2022 |  |  |  |  |
Lease agreement term |  | 2 years |  |  |  |  |
Rent payment |  | $ 400 |  |  |  |  |
Maximum |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |
Short term lease period |  |  |  |  | 12 months |  |
Maximum | Vehicles |  |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |  |
Lease agreement term |  |  |  |  | 36 months |  |

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