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Collaboration Agreements and Revenues - Summary of Product Revenue, Net (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 24,364 | $ 42,888 | $ 62,793 | $ 67,288
Discounts and Rebates [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 600 | 4,100 | 1,200 | 4,500
Product Revenue, Net [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 13,371 | 15,693 | 28,733 | 20,648
Product Revenue, Net [Member] | Direct Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Gross revenue | 2,230 | 19,833 | 7,659 | 25,205
Total revenue | 1,611 | 15,693 | 6,566 | 20,648
Product Revenue, Net [Member] | Direct Sales [Member] | Discounts and Rebates [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | (618) | (4,095) | (1,181) | (4,512)
Product Revenue, Net [Member] | Direct Sales [Member] | Sales Returns [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | (1) | (45) | 88 | (45)
Product Revenue, Net [Member] | Sales To Falikang [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 11,760 | 0 | 22,167 | 0
Gross transfer price | 26,714 | 0 | 51,115 | 0
Product Revenue, Net [Member] | Sales To Falikang [Member] | Profit Share [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | (9,573) | 0 | (19,636) | 0
Product Revenue, Net [Member] | Sales To Falikang [Member] | Net Transfer Price [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 17,141 | 0 | 31,479 | 0
Product Revenue, Net [Member] | Sales To Falikang [Member] | Increase in Deferred Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ (5,381) | $ 0 | $ (9,312) | $ 0

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