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Concentrations of Credit Risk (Revenues by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Concentration Risk [Line Items]
Collaboration revenues	$ 11,004	$ 4,634	$ 23,014	$ 10,962
Geographic Concentration Risk [Member] | Revenues [Member] | U.S. [Member]
Concentration Risk [Line Items]
Collaboration revenues	89,371	32,192	163,046	45,786
Geographic Concentration Risk [Member] | Revenues [Member] | Europe [Member]
Concentration Risk [Line Items]
Collaboration revenues	5,494	4,060	10,024	5,893
Geographic Concentration Risk [Member] | Revenues [Member] | Japan [Member]
Concentration Risk [Line Items]
Collaboration revenues	$ 4,143	$ 0	$ 6,825	$ 0

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of revenue earned from products sold or services provided under the terms of a contract, including, but not limited to, government contracts and construction contracts, classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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