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v3.20.1

Revenue Recognition - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2020
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

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- Definition Accounts receivable credit period + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Cash discount percent. + References No definition available. + Details
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Namespace Prefix: | amrn_
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Balance Type: | na
Period Type: | instant

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- Definition Product expiration period upon conversion into capsule form. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- 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
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- Definition Indicates (true false) whether practical expedient was elected not to adjust consideration for effect of financing component when transfer and customer payment for product or service occurs within one year or less. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130569-203045 + Details
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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- Details
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