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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2012
Future Minimum Lease Payments | Future minimum lease payments under these leases as of December 31, 2012 are as follows (in thousands):
Year Ending December 31, |  | Operating |  |  | Capital |
2013 |  | $ | 706 |  |  | $ | 4 |
2014 |  |  | 384 |  |  |  | 4 |
2015 |  |  | — |  |  |  | 3 |
Total |  | $ | 1,090 |  |  |  | 11 |
Less: interest |  |  |  |  |  |  | — |
Total principal obligations |  |  |  |  |  |  | 11 |
Less: current portion |  |  |  |  |  |  | 4 |
Long-term capital lease |  |  |  |  |  | $ | 7 |

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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