XML 53 R43.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Revenue Recognition - Additional Information (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |
Payment period from distributors received from date of sale | 30 days
Sales discount percentage | 2.00%
Effect of significant financing component when transfer and customer payment of good or service occurs within one year or less | true
Vascepa 1-Gram |
Disaggregation Of Revenue [Line Items] |
Product expiration date after being converted into capsule form | 4 years
Vascepa 0.5-Gram |
Disaggregation Of Revenue [Line Items] |
Product expiration date after being converted into capsule form | 3 years
Minimum |
Disaggregation Of Revenue [Line Items] |
Payment period from distributors received from date of sale | 30 days
Maximum |
Disaggregation Of Revenue [Line Items] |
Payment period from distributors received from date of sale | 60 days

X
- Definition Accounts receivable credit period + References No definition available. + Details
Name: | amrn_AccountsReceivableCreditPeriod
Namespace Prefix: | amrn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash discount percent. + References No definition available. + Details
Name: | amrn_CashDiscountPercent
Namespace Prefix: | amrn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Product expiration period upon conversion into capsule form. + References No definition available. + Details
Name: | amrn_ProductExpirationPeriodUponConversionIntoCapsuleForm
Namespace Prefix: | amrn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates (true/false) whether practical expedient is elected not to adjust consideration for effect of financing component when transfer and customer payment of good or service occurs within one year or less. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130569-203045 + Details
Name: | us-gaap_RevenuePracticalExpedientFinancingComponent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ProductOrServiceAxis=amrn_VascepaOneGramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=amrn_VascepaHalfGramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |