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License Agreement Revenue - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Feb. 28, 2021
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |
Income tax expense | $ 1,100,000 | $ 0 |
Exclusive License And Collaboration Agreement |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [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 |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |
Potential development and commercial milestones yet to receive |  |  | $ 110,000,000.0
Asset Purchase Agreement | Cypralis Limited |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |
Revenue recognized | 0 |  |
License Agreement | Waterstone Pharmaceutical HK Limited |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |
Revenue recognized | $ 0 |  |

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