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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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