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Licenses (Details) (Licenses, USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  | 0 Months Ended | 7 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Inactivated hepatitis A | Dec. 31, 2012 Inactivated hepatitis A | Dec. 31, 2013 Combined inactivated hepatitis A&B | Dec. 31, 2012 Combined inactivated hepatitis A&B | Aug. 15, 2011 H5N1 licenses item | Aug. 14, 2012 H5N1 licenses | Dec. 31, 2013 H5N1 licenses | Dec. 31, 2012 H5N1 licenses
Licenses |  |  |  |  |  |  |  |  |  |  |
Cost | $ 5,511 | $ 5,355 |  | $ 3,490 | $ 3,391 | $ 502 | $ 488 |  |  | $ 1,519 | $ 1,476
Accumulated amortization | 4,739 | 4,205 |  | 3,490 | 3,391 | 452 | 390 |  |  | 797 | 424
Estimated useful life | 9 years 1 month 28 days |  |  |  |  |  |  |  | 20 years |  |
Amortization expense | 435 | 228 | 268 |  |  |  |  |  |  |  |
Estimated amortization expenses |  |  |  |  |  |  |  |  |  |  |
Within 1 year | 411 |  |  |  |  |  |  |  |  |  |
Between 1 and 2 years | 361 |  |  |  |  |  |  |  |  |  |
Net book value | $ 772 | $ 1,150 |  |  |  | $ 50 | $ 98 |  |  | $ 722 | $ 1,052
Number of sublicense agreements entered with Medimmune |  |  |  |  |  |  |  | 3 |  |  |

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