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Collaboration and Other Agreements - Incyte (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) performance_obligation | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 18,741 | $ 20,798 |  | $ 38,996 | $ 44,327 |
Incyte Corporation | Incyte MGA012 Agreement |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Non-refundable upfront payment |  |  |  | $ 150,000 |  |  |
Potential development and regulatory milestone payments under agreement | $ 420,000 |  |  |  |  |  |
Potential commercial milestone payments under agreement | 330,000 |  |  |  |  |  |
Development and regulatory milestones recognized |  |  |  |  |  |  | $ 15,000
Number of performance obligations | performance_obligation |  |  |  | 2 |  |  |
Collaborative agreement transaction price | 154,000 |  |  |  |  |  |
Variable consideration recognized | $ 4,000 |  |  |  |  |  |
Incyte Corporation | Incyte MGA012 Agreement - Clinical activities |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Development and regulatory milestones recognized |  |  | 10,000 |  |  | 10,000 |
Maximum | Incyte Corporation | Incyte MGA012 Agreement |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Proceeds from royalties (percent) | 24.00% |  |  |  |  |  |
Minimum | Incyte Corporation | Incyte MGA012 Agreement |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Proceeds from royalties (percent) | 15.00% |  |  |  |  |  |
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Agreement |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Revenues | $ 150,000 |  |  |  | 13,100 |  |
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Agreement - Clinical activities |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Revenues |  | 0 | 10,500 |  | $ 100 | 13,600 |
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Agreement - Services |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 4,900 | $ 6,100 |  |  | $ 16,000 |

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