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Collaboration and Other Agreements - I-Mab Biopharma (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Collaboration and Other Agreements [Line Items] |  |  |  |
Revenues |  | $ 104,883 | $ 64,188 | $ 60,121
I-Mab Biopharma Collaboration And License Agreement | I-Mab |  |  |  |
Collaboration and Other Agreements [Line Items] |  |  |  |
Non-refundable upfront payment | $ 15,000 |  |  |
Potential development and regulatory milestone payments |  | 135,000 |  |
Estimated variable consideration |  | 1,000 |  |
Revenues |  | 2,100 | 2,300 |
Deferred revenue |  | 11,400 | 13,500 |
Deferred revenue, current |  | 4,500 | 4,400 |
Deferred revenue, noncurrent |  | $ 6,900 | $ 9,100 |
I-Mab Biopharma Collaboration And License Agreement | I-Mab | Maximum |  |  |  |
Collaboration and Other Agreements [Line Items] |  |  |  |
Potential proceeds from royalties percent | 20.00% |  |  |

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