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Collaboration and Other Agreements, Janssen Biotech, Inc. (Details) - Janssen Biotech, Inc. [Member] - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2015 | Jul. 31, 2015
Collaboration and Other Agreements [Line Items] |  |  |  |
Sale of common stock (in shares) | 1,923,077 |  |  |
Sale of common stock (in dollars per share) | $ 39.00 |  |  |
Proceeds of stock sale | $ 75.0 |  |  |
Additional Potential Clinical Milestone Payments Under Agreement |  | $ 205.0 | $ 205.0 |
Additional Potential Regulatory Milestone Payments Under Agreement |  | 220.0 | 220.0 |
Additional Potential Sales Milestone Payments Under Agreement |  | 150.0 | 150.0 |
Premium received on stock purchase | 12.3 |  |  |
Recognized revenue under agreement |  | $ 10.0 | $ 72.3 |
Non-refundable upfront payment | 50.0 |  |  |
Amount allocated to equity | 62.7 |  |  |
Amount allocated to license and R&D | 62.3 |  |  |
Total consideration | $ 125.0 |  |  |
Clinical milestone earned during period |  |  |  | $ 10.0

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