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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2014
Future Minimum Lease Payments | Future minimum lease payments under these leases as of December 31, 2014 are as follows (in thousands):
Year Ending December 31, |  | Operating |
2015 |  | $ | 636 |
2016 |  |  | 617 |
2017 |  |  | 628 |
2018 |  |  | 158 |
2019 |  |  | — |
Total |  | $ | 2,039 |

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- Definition Schedule of Future Minimum Lease Payments for Capital Lease and Operating Lease [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | amrn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration