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Collaboration Agreements, License Agreement and Revenues - Deferred Revenue - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |
Deferred revenue | $ 7,003 | $ 2,147
Product Revenue, Net [Member] | Beijing Falikang Pharmaceutical Co Ltd |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |
Reductions to gross accounts receivable | 23,100 |
AstraZeneca Agreements [Member] |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |
Deferred revenue | 160,267 | $ 137,338
AstraZeneca Agreements [Member] | China [Member] |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |
Deferred revenue | $ 8,500 |

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