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Revenue - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Feb. 28, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue | $ 516,000 | $ 0 | $ 12,566,000 | $ 0 |
Income tax expense | (50,000) | 0 | (3,088,000) | (3,144,000) |
Exclusive License And Collaboration Agreement |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Non refundable upfront payment received |  |  | 10,000,000.0 |  |
Transaction price |  |  | 12,100,000 |  |
Fixed upfront cash payment |  |  | 10,000,000.0 |  |
Amount related to withholding tax obligations |  |  | 1,100,000 |  |
Revenue recognized |  |  | 1,100,000 |  |
Income tax expense |  |  | 1,100,000 |  |
Exclusive License And Collaboration Agreement | Maximum |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Potential development and commercial milestones yet to receive |  |  |  |  | $ 110,000,000.0
Asset Purchase Agreement | Cypralis Limited |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue recognized | 0 |  | 0 |  |
License Agreement | Waterstone Pharmaceutical HK Limited |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue recognized | $ 0 |  | 0 |  |
Sales Revenue Net | Customer Concentration Risk | Wholesaler One |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Percentage of gross revenue | 55.00% |  |  |  |
Sales Revenue Net | Customer Concentration Risk | Wholesaler Two |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Percentage of gross revenue | 20.00% |  |  |  |
Sales Revenue Net | Customer Concentration Risk | Wholesaler Three |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Percentage of gross revenue | 16.00% |  |  |  |
Product Revenue, Net |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue | $ 516,000 | $ 0 | $ 516,000 | $ 0 |

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