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Collaboration and Other Agreements - I-Mab Biopharma (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2020
Collaboration And Other Agreements [Line Items] |  |  |  |  |  |
Revenues | $ 30,757 | $ 20,257 | $ 47,638 | $ 33,939 |  |
Deferred revenue, current | 16,565 |  | 16,565 |  |  | $ 4,456
Deferred revenue, net of current portion | 13,476 |  | 13,476 |  |  | 6,926
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 | 1,700 | $ 1,400 | 2,300 | $ 2,500 |  |
Deferred revenue | 9,000 |  | 9,000 |  |  | 11,400
Deferred revenue, current | 3,400 |  | 3,400 |  |  | 4,500
Deferred revenue, net of current portion | $ 5,600 |  | $ 5,600 |  |  | $ 6,900
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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