XML 45 R31.htm IDEA: XBRL DOCUMENT
v3.20.4

Revenue Recognition (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Revenue From Contract With Customer [Abstract] |
Summarize Activity of the Net Product Revenue Allowance and Reserve Categories | The following tables summarize activity in each of the net product revenue allowance and reserve categories described above for the years ended December 31, 2020 and 2019:
In thousands |  | Trade Allowances |  |  | Rebates, Chargebacks and Discounts |  |  | Product Returns |  |  | Other Incentives |  |  | Total |
Balance as of January 1, 2019 |  | $ | 19,495 |  |  | $ | 41,634 |  |  | $ | 2,948 |  |  | $ | 1,167 |  |  | $ | 65,244 |
Provision related to current period sales |  |  | 92,378 |  |  |  | 403,865 |  |  |  | 2,430 |  |  |  | 47,169 |  |  |  | 545,842 |
Provision related to prior period sales |  |  | — |  |  |  | (324 | ) |  |  | — |  |  |  | — |  |  |  | (324 | )
Credits/payments made for current period sales |  |  | (63,288 | ) |  |  | (312,790 | ) |  |  | 5 |  |  |  | (43,416 | ) |  |  | (419,489 | )
Credits/payments made for prior period sales |  |  | (19,324 | ) |  |  | (41,388 | ) |  |  | (804 | ) |  |  | (1,200 | ) |  |  | (62,716 | )
Balance as of December 31, 2019 |  |  | 29,261 |  |  |  | 90,997 |  |  |  | 4,579 |  |  |  | 3,720 |  |  |  | 128,557 |
Provision related to current period sales |  |  | 132,881 |  |  |  | 621,937 |  |  |  | 3,543 |  |  |  | 64,452 |  |  |  | 822,813 |
Provision related to prior period sales |  |  | — |  |  |  | (3,872 | ) |  |  | — |  |  |  | — |  |  |  | (3,872 | )
Credits/payments made for current period sales |  |  | (96,834 | ) |  |  | (482,254 | ) |  |  | — |  |  |  | (58,911 | ) |  |  | (637,999 | )
Credits/payments made for prior period sales |  |  | (29,066 | ) |  |  | (85,608 | ) |  |  | (324 | ) |  |  | (3,677 | ) |  |  | (118,675 | )
Balance as of December 31, 2020 |  | $ | 36,242 |  |  | $ | 141,200 |  |  | $ | 7,798 |  |  | $ | 5,584 |  |  | $ | 190,824 |

X
- Definition Summary of net product revenue valuation allowances. + References No definition available. + Details
Name: | amrn_SummaryOfNetProductRevenueValuationAllowancesTableTextBlock
Namespace Prefix: | amrn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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