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Leases - Additional Information (Detail) $ in Thousands |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 15, 2019 USD ($) RenewalOption | Jan. 26, 2019 | Sep. 30, 2011 | Jul. 01, 2011 | Mar. 31, 2019 USD ($)
Lessee Lease Description [Line Items] |  |  |  |  |
Incremental borrowing rate for purposes of calculation of lease liabilities |  |  |  |  | 11.50%
Change in incremental borrwing rate |  |  |  |  | 1.00%
Short-term lease commited aggregate payment amount |  |  |  |  | $ 300
Monthly rent payment |  |  |  |  | 18,224
Operating lease liability |  |  |  |  | 9,000
Current operating lease liability |  |  |  |  | $ 1,095
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] |  |  |  |  | amrn:AccruedLiabilitiesAndOtherLiabilitiesCurrent
Operating lease right-of-use asset |  |  |  |  | $ 8,900
Operating lease expense |  |  |  |  | $ 300
Dublin |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease, expiration date |  |  | Oct. 31, 2019 |  |
Bedminster |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Operating lease, expiration date |  | Jun. 30, 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 commencement date | Aug. 15, 2019 |  |  |  |
Lease agreement term | 11 years |  |  |  |
Number of renewal options | RenewalOption | 2 |  |  |  |
Lease renewal term | 5 years |  |  |  |
Lease termination existence of option to extend | true |  |  |  |
Monthly rent payment | $ 100 |  |  |  |
Maximum |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Short term lease period |  |  |  |  | 12 months

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- Definition Description of lessee's operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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