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Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Nov. 29, 2016
Intangible Assets and Goodwill |  |  |  |  |  |
Goodwill | $ 90,976 |  | $ 90,976 |  | $ 90,976 |
Finite-lived intangible asset |  |  |  |  |  |
Accumulated Amortization | (6,951) |  | (6,951) |  | (6,503) |
Total Intangible Assets |  |  |  |  |  |
Cost of total intangible assets | 87,990 |  | 87,990 |  | 87,990 |
Intangible Assets, Net | 81,039 |  | 81,039 |  | 81,487 |
Amortization expense for intangible assets | 224 | $ 254 | $ 448 | $ 507 |  |
Kolltan |  |  |  |  |  |
Intangible Assets and Goodwill |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 82,011
Amgen Amendment |  |  |  |  |  |
Finite-lived intangible asset |  |  |  |  |  |
Estimated Life |  |  | 16 years |  |  |
Cost | 14,500 |  | $ 14,500 |  | 14,500 |
Accumulated Amortization | (6,951) |  | (6,951) |  | (6,503) |
Net | 7,549 |  | 7,549 |  | 7,997 |
IPR&D |  |  |  |  |  |
Indefinite-lived intangible assets: |  |  |  |  |  |
Indefinite-lived intangible assets | 73,490 |  | 73,490 |  | $ 73,490 |
IPR&D | CuraGen |  |  |  |  |  |
Indefinite-lived intangible assets: |  |  |  |  |  |
Indefinite-lived intangible assets | $ 11,800 |  | $ 11,800 |  |  |
IPR&D | Kolltan | CDX-0158 |  |  |  |  |  |
Indefinite-lived intangible assets: |  |  |  |  |  |
Fair value of Intangible assets |  |  |  |  |  | 40,000
IPR&D | Kolltan | CDX-3379 |  |  |  |  |  |
Indefinite-lived intangible assets: |  |  |  |  |  |
Fair value of Intangible assets |  |  |  |  |  | 3,500
IPR&D | Kolltan | TAM |  |  |  |  |  |
Indefinite-lived intangible assets: |  |  |  |  |  |
Fair value of Intangible assets |  |  |  |  |  | $ 18,000

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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