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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation Of Revenue [Line Items]        
Total revenue $ 46,333 $ 40,134 $ 152,877 $ 120,614
Product Revenue, Net [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 46,210 29,390 126,391 77,439
Product Revenue, Net [Member] | Direct Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Gross revenue 4,355 3,186 12,186 9,853
Total revenue 3,989 2,927 11,052 9,092
Product Revenue, Net [Member] | Direct Sales [Member] | Discounts and Rebates [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue (363) (261) (1,130) (763)
Product Revenue, Net [Member] | Direct Sales [Member] | Sales Returns [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue (3) 2 (4) 2
Product Revenue, Net [Member] | Sales To Falikang [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 42,221 26,463 115,339 68,347
Gross transaction price 53,696 42,294 146,608 118,696
Product Revenue, Net [Member] | Sales To Falikang [Member] | Profit Share [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue (23,973) (18,130) (64,393) (51,430)
Product Revenue, Net [Member] | Sales To Falikang [Member] | Net Transfer Price [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 29,723 24,164 82,215 67,266
Product Revenue, Net [Member] | Sales To Falikang [Member] | Decrease in deferred revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue $ 12,498 $ 2,299 $ 33,124 $ 1,081