XML 29 R41.htm IDEA: XBRL DOCUMENT
v3.20.1

Revenue Recognition - Summarize Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | $ 128,557 | $ 65,244
Provision related to current period sales | 183,704 | 94,995
Provision related to prior period sales | (3,209) |
Credits/payments made for current period sales | (51,619) | (28,009)
Credits/payments made for prior period sales | (108,651) | (47,659)
Ending balance | 148,782 | 84,571
Trade Allowances |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 29,261 | 19,495
Provision related to current period sales | 30,640 | 15,881
Credits/payments made for current period sales | (6,872) | (2,624)
Credits/payments made for prior period sales | (29,047) | (8,760)
Ending balance | 23,982 | 23,992
Rebates, Chargebacks and Discounts |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 90,997 | 41,634
Provision related to current period sales | 133,721 | 70,410
Provision related to prior period sales | (3,209) |
Credits/payments made for current period sales | (33,927) | (18,494)
Credits/payments made for prior period sales | (75,738) | (37,521)
Ending balance | 111,844 | 56,029
Product Returns |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 4,579 | 2,948
Provision related to current period sales | 815 | 418
Credits/payments made for prior period sales | (145) | (179)
Ending balance | 5,249 | 3,187
Other Incentives |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 3,720 | 1,167
Provision related to current period sales | 18,528 | 8,286
Credits/payments made for current period sales | (10,820) | (6,891)
Credits/payments made for prior period sales | (3,721) | (1,199)
Ending balance | $ 7,707 | $ 1,363

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) -URI http://asc.fasb.org/extlink&oid=26873400&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) -URI http://asc.fasb.org/extlink&oid=26873400&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: |