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Intangible Assets and Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Intangible Assets and Goodwill |  |
Goodwill | $ 8,965 | $ 8,965
Finite-lived intangible asset |  |
Accumulated Amortization | (5,029) | (4,776)
Total Intangible Assets |  |
Cost of total intangible assets | 27,596 | 27,596
Intangible Assets, Net (Excluding Goodwill) | 22,567 | 22,820
Amgen Amendment |  |
Finite-lived intangible asset |  |
Estimated Life | 16 years |
Cost | 14,500 | 14,500
Accumulated Amortization | (4,036) | (3,812)
Net | 10,464 | 10,688
Core Technology |  |
Finite-lived intangible asset |  |
Estimated Life | 11 years |
Cost | 1,296 | 1,296
Accumulated Amortization | (993) | (964)
Net | 303 | 332
IPR&D |  |
Indefinite-lived intangible assets: |  |
Indefinite-lived intangible assets | $ 11,800 | $ 11,800

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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