XML 69 R50.htm IDEA: XBRL DOCUMENT v3.19.2

Subsequent Events - Additional Information (Detail) - American Depositary Shares - USD ($) $ / shares in Units, $ in Millions	Jul. 29, 2019	Jul. 18, 2019	Nov. 29, 2018	Feb. 01, 2018
Subsequent Event [Line Items]
Issuance of stock (shares)			11,111,112	19,178,082
Sale of stock price per share			$ 17.575	$ 3.41
Over allotment option, exercisable period				30 days
Over-Allotment Option
Subsequent Event [Line Items]
Issuance of stock (shares)				2,876,712
Subsequent Event
Subsequent Event [Line Items]
Issuance of stock (shares)		22,222,223
Sale of stock price per share		$ 18.00
Over allotment option, exercisable period		30 days
Subsequent Event | Over-Allotment Option
Subsequent Event [Line Items]
Issuance of stock (shares)		3,333,333
Sale of stock price per share		$ 18.00
Gross proceeds from public offering including exercised option	$ 460.0
Net proceeds from public offering including exercised option	$ 439.5

X

- Definition

Proceeds from issuance of common stock including stock option exercises.

+ References

No definition available.

+ Details

Name:	amrn_ProceedsFromIssuanceOfCommonStockIncludingStockOptionExercises
Namespace Prefix:	amrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Proceeds from issuance of common stock including stock option exercises net.

+ References

No definition available.

+ Details

Name:	amrn_ProceedsFromIssuanceOfCommonStockIncludingStockOptionExercisesNet
Namespace Prefix:	amrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Public offering over allotment option exercise period.

+ References

No definition available.

+ Details

Name:	amrn_PublicOfferingOverAllotmentOptionExercisePeriod
Namespace Prefix:	amrn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=amrn_AmericanDepositaryShareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: