XML 49 R39.htm IDEA: XBRL DOCUMENT
v3.21.2

Revenue Recognition - Summarize Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | $ 190,827 | $ 128,557
Provision related to current period sales | 409,766 | 361,984
Provision related to prior period sales | (854) | (3,872)
Credits/payments made for current period sales | (212,807) | (206,059)
Credits/payments made for prior period sales | (168,242) | (118,601)
Ending balance | 218,690 | 162,009
Trade Allowances |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 36,242 | 29,261
Provision related to current period sales | 60,487 | 59,829
Credits/payments made for current period sales | (19,874) | (23,197)
Credits/payments made for prior period sales | (34,511) | (29,067)
Ending balance | 42,344 | 36,826
Rebates, Chargebacks and Discounts |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 141,201 | 90,997
Provision related to current period sales | 321,400 | 266,823
Provision related to prior period sales | (854) | (3,872)
Credits/payments made for current period sales | (170,389) | (152,965)
Credits/payments made for prior period sales | (127,379) | (85,622)
Ending balance | 163,979 | 115,361
Product Returns |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 7,797 | 4,579
Provision related to current period sales | 1,750 | 1,589
Credits/payments made for prior period sales | (763) | (191)
Ending balance | 8,784 | 5,977
Other Incentives |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 5,587 | 3,720
Provision related to current period sales | 26,129 | 33,743
Credits/payments made for current period sales | (22,544) | (29,897)
Credits/payments made for prior period sales | (5,589) | (3,721)
Ending balance | $ 3,583 | $ 3,845

X
- Definition Credits/payments made for prior period sales. + References No definition available. + Details
Name: | amrn_CreditsPaymentsMadeForPriorPeriodSales
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Provision related to prior period sales. + References No definition available. + Details
Name: | amrn_ProvisionRelatedToPriorPeriodSales
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Valuation allowances provisions and reserves balance net. + References No definition available. + Details
Name: | amrn_ValuationAllowancesProvisionsAndReservesBalanceNet
Namespace Prefix: | amrn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | srt_ValuationAndQualifyingAccountsDisclosureLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesDeductions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_AllowanceForCreditLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=amrn_RebatesChargebacksAndDiscountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=amrn_ProductReturnsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=amrn_OtherIncentiveProgramsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |