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Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Nov. 29, 2016
Intangible Assets and Goodwill
Goodwill	$ 90,976		$ 90,976
Finite-lived intangible asset
Accumulated Amortization	(6,727)		(6,503)
Total Intangible Assets
Cost of total intangible assets	87,990		87,990
Intangible Assets, Net	81,263		81,487
Amortization expense for intangible assets	$ 224	$ 253
Kolltan
Intangible Assets and Goodwill
Goodwill				$ 82,011
Amgen Amendment
Finite-lived intangible asset
Estimated Life	16 years
Cost	$ 14,500		14,500
Accumulated Amortization	(6,727)		(6,503)
Net	7,773		7,997
IPR&D
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	73,490		$ 73,490
IPR&D | CuraGen
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	$ 11,800
IPR&D | Kolltan | CDX-1058
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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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.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Fair value portion of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit.

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