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Concentrations of Credit Risk (Revenues by Geographic Region) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Concentration Risk [Line Items] |  |
Collaboration revenues | $ 12,010 | $ 6,328
Geographic Concentration Risk [Member] | Revenues [Member] | U.S. [Member] |  |
Concentration Risk [Line Items] |  |
Collaboration revenues | 73,675 | 13,594
Geographic Concentration Risk [Member] | Revenues [Member] | Europe [Member] |  |
Concentration Risk [Line Items] |  |
Collaboration revenues | 4,530 | 1,833
Geographic Concentration Risk [Member] | Revenues [Member] | Japan [Member] |  |
Concentration Risk [Line Items] |  |
Collaboration revenues | $ 2,682 | $ 0

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