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Collaboration and Other Agreements - Incyte Corporation (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 24 Months Ended | 42 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2017 USD ($) performanceObligation | Dec. 31, 2018 USD ($) | Jun. 30, 2021 USD ($)
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Revenues | $ 30,757,000 | $ 20,257,000 | $ 47,638,000 | $ 33,939,000 |  |  |
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 | 5,000,000.0 |  | 15,000,000.0 |  |  |  | $ 70,000,000.0
Number of performance obligations | performanceObligation |  |  |  |  | 2 |  |
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 Clinical Services |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Revenues | 700,000 | $ 1,500,000 | 800,000 | $ 7,400,000 |  |  |
Revenues From License Agreements | Incyte Corporation | Incyte MGA012 Supply Agreement |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Revenues | $ 2,800,000 |  | $ 5,900,000 |  |  |  |

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