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Avinza Co-Promotion (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Summary of co-promote termination liability |  |
Total co-promote termination liability at beginning of period | $ 12,534 | $ 21,452
Assumed payments made by Pfizer or assignee | (3,310) | (3,479)
Fair value adjustments due to passage of time | 2,522 | (5,439)
Total co-promote termination liability at end of period | 11,746 | 12,534
Less: current portion of co-promote termination liability as of December 31, 2013 | 4,329 |
Long-term portion of co-promote termination liability as of December 31, 2013 | $ 7,417 |

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