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Collaboration and Other Agreements - Incyte Corporation (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2017 | Jun. 30, 2019
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Revenues |  | $ 13,682,000 | $ 9,662,000 |  |
Incyte Corporation | Incyte MGA012 Agreement |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Non-refundable upfront payment |  |  |  | $ 150,000,000.0 |
Potential development and regulatory milestone payments under agreement | $ 420,000,000.0 |  |  |  |
Potential commercial milestone payments under agreement | 330,000,000.0 |  |  |  |
Development and regulatory milestones recognized |  |  |  |  | $ 15,000,000.0
Collaborative agreement transaction price | 154,000,000.0 |  |  |  |
Variable consideration recognized | $ 4,000,000.0 |  |  |  |
Maximum | Incyte Corporation | Incyte MGA012 Agreement |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Potential proceeds from royalties (percent) | 24.00% |  |  |  |
Minimum | Incyte Corporation | Incyte MGA012 Agreement |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Potential proceeds from royalties (percent) | 15.00% |  |  |  |
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Agreement |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Revenues | $ 150,000,000.0 |  |  |  |
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Agreement - Clinical activities |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 |  |
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Agreement - Services |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Revenues |  | $ 5,900,000 | $ 4,000,000.0 |  |

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