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Intangible Assets and Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Intangible Assets and Goodwill |  |
Goodwill | $ 8,965 | $ 8,965
Finite-lived intangible asset |  |
Accumulated Amortization | (4,016) | (3,763)
Total Intangible Assets |  |
Cost of total intangible assets | 27,596 | 27,596
Intangible Assets, Net (Excluding Goodwill) | 23,580 | 23,833
Amgen Amendment |  |
Finite-lived intangible asset |  |
Estimated Life | 16 years |
Cost | 14,500 | 14,500
Accumulated Amortization | (3,139) | (2,915)
Net | 11,361 | 11,585
Core Technology |  |
Finite-lived intangible asset |  |
Estimated Life | 11 years |
Cost | 1,296 | 1,296
Accumulated Amortization | (877) | (848)
Net | 419 | 448
IPR&D |  |
Indefinite-lived intangible assets: |  |
Indefinite-lived intangible assets | $ 11,800 | $ 11,800

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