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Collaboration and Other Agreements - I-Mab Biopharma (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jul. 09, 2019
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Revenues |  | $ 18,253 | $ 18,741 | $ 52,192 | $ 38,996 |  |
Deferred revenue, current |  | 9,259 |  | 9,259 |  | $ 10,700 |
Deferred revenue, net of current portion |  | 5,778 |  | 5,778 |  | 9,153 |
I-Mab | I-Mab Biopharma Collaboration and License Agreement |  |  |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |  |
Non-refundable upfront payment | $ 15,000 |  |  |  |  |  |
Potential development and regulatory milestone payments under agreement |  |  |  |  |  |  | $ 135,000
Estimated variable consideration | $ 1,000 |  |  |  |  |  |
Revenues |  | 1,000 | $ 600 | 3,500 | $ 600 |  |
Deferred revenue |  | 10,000 |  | 10,000 |  | 13,500 |
Deferred revenue, current |  | 4,300 |  | 4,300 |  | 4,400 |
Deferred revenue, net of current portion |  | $ 5,700 |  | $ 5,700 |  | $ 9,100 |
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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