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Collaboration and Other Agreements - I-Mab Biopharma (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Jul. 09, 2019
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 20,257,000 | $ 10,593,000 | $ 33,939,000 | $ 20,255,000 |  |
Deferred revenue, current |  | 9,267,000 |  | 9,267,000 |  | $ 10,700,000 |
Deferred revenue, net of current portion |  | 6,819,000 |  | 6,819,000 |  | 9,153,000 |
I-Mab | I-Mab Biopharma Collaboration and License Agreement |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Non-refundable upfront payment | $ 15,000,000.0 |  |  |  |  |  |
Potential development and regulatory milestone payments under agreement |  |  |  |  |  |  | $ 135,000,000.0
Estimated variable consideration | $ 1,000,000.0 |  |  |  |  |  |
Revenues |  | 1,400,000 | $ 0 | 2,500,000 | $ 0 |  |
Deferred revenue |  | 11,100,000 |  | 11,100,000 |  | 13,500,000 |
Deferred revenue, current |  | 4,300,000 |  | 4,300,000 |  | 4,400,000 |
Deferred revenue, net of current portion |  | $ 6,800,000 |  | $ 6,800,000 |  | $ 9,100,000 |
I-Mab | I-Mab Biopharma Collaboration and License Agreement | Maximum |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Potential proceeds from royalties (percent) | 20.00% |  |  |  |  |  |

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