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Collaboration and Other Agreements - I-Mab Biopharma (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Revenues | $ 11,101 | $ 16,881 |  |  |
Deferred revenue, current | 25,562 |  |  | $ 20,646 |
Deferred revenue, net of current portion | 6,364 |  |  | 0 |
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
Development and regulatory milestones recognized | 5,000 |  |  | 5,000 |
Estimated variable consideration |  |  | $ 1,000 |  |
Revenues | 200 | $ 600 |  |  |
Deferred revenue | 4,400 |  |  | 4,500 |
One Time Millstone Credit |  |  |  | $ 4,500 |
I-Mab | I-Mab Biopharma Collaboration and License Agreement | Maximum |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Potential proceeds from royalties (percent) |  |  | 20.00% |  |
I-Mab | I-Mab Biopharma Collaboration And License Agreement Clinical Supply |  |  |  |  |
Collaboration And Other Agreements [Line Items] |  |  |  |  |
Revenues | $ 900 |  |  |  |

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