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Collaboration Agreements, License Agreement and Revenues - Summary of Product Revenue, Net (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 40,134 | $ 15,735 | $ 120,614 | $ 106,367
Product Revenue, Net [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 29,390 | 17,359 | 77,439 | 59,495
Product Revenue, Net [Member] | Direct Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Gross revenue | 3,186 | 2,610 | 9,853 | 8,972
Total revenue | 2,927 | 2,445 | 9,092 | 8,622
Product Revenue, Net [Member] | Direct Sales [Member] | Discounts and Rebates [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | (261) | (166) | (763) | (353)
Product Revenue, Net [Member] | Direct Sales [Member] | Sales Returns [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2 | 1 | 2 | 3
Product Revenue, Net [Member] | Sales To Falikang [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 26,463 | 14,914 | 68,347 | 50,873
Gross transfer price | 42,294 | 32,510 | 118,696 | 83,517
Product Revenue, Net [Member] | Sales To Falikang [Member] | Profit Share [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | (18,130) | (12,980) | (51,430) | (31,894)
Product Revenue, Net [Member] | Sales To Falikang [Member] | Net Transfer Price [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 24,164 | 19,530 | 67,266 | 51,623
Product Revenue, Net [Member] | Sales To Falikang [Member] | Decrease (Increase) in Deferred Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 2,299 | $ (4,616) | $ 1,081 | $ (750)

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