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Collaboration and Other Agreements, Incyte Corporation (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Collaboration and Other Agreements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 15,794 | $ 20,798 | $ 18,834 | $ 4,695 | $ 152,359 | $ 1,663 | $ 1,666 | $ 2,055 | $ 60,121 | $ 157,742 | $ 91,880
Incyte MGA012 Agreement | Incyte Corporation (Incyte) |  |  |  |  |  |  |  |  |  |  |  |
Collaboration and Other Agreements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-refundable upfront payment |  |  |  |  |  | $ 150,000 |  |  |  |  |  |
Amounts recognized |  |  |  |  |  |  |  |  |  | 15,000 |  |
Transaction price | $ 154,000 |  |  |  |  |  |  |  |  |  |  |
Clinical trial activities selling price amount | 4,000 |  |  |  |  |  |  |  |  |  |  |
Maximum | Incyte MGA012 Agreement | Incyte Corporation (Incyte) |  |  |  |  |  |  |  |  |  |  |  |
Collaboration and Other Agreements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Potential development and regulatory milestone payments | 420,000 |  |  |  |  |  |  |  |  |  |  |
Potential commercial milestone payments | $ 330,000 |  |  |  |  |  |  |  |  |  |  |
Potential proceeds from royalties percent | 24.00% |  |  |  |  |  |  |  |  |  |  |
Minimum | Incyte MGA012 Agreement | Incyte Corporation (Incyte) |  |  |  |  |  |  |  |  |  |  |  |
Collaboration and Other Agreements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Potential proceeds from royalties percent | 15.00% |  |  |  |  |  |  |  |  |  |  |
Revenues From License Agreements | Incyte MGA012 Agreement | Incyte Corporation (Incyte) |  |  |  |  |  |  |  |  |  |  |  |
Collaboration and Other Agreements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 18,800 | $ 151,100 |
Revenues From License Agreements | Incyte MGA012 Clinical Services | Incyte Corporation (Incyte) |  |  |  |  |  |  |  |  |  |  |  |
Collaboration and Other Agreements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 22,200 |  |

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