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Liabilities Related to Sales of Future Royalties - Additional Information (Detail) - USD ($) | Dec. 30, 2020 | Dec. 16, 2020 | Feb. 24, 2012
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2012 Purchase and Sale Agreement |  |  |
Liability Related to Sale of Future Royalties [Line Items] |  |  |
Proceeds from sale of royalty rights |  |  | $ 124,000,000
Transaction costs related to sale of potential future royalties |  |  | $ 4,400,000
2020 Purchase and Sale Agreement |  |  |
Liability Related to Sale of Future Royalties [Line Items] |  |  |
Proceeds from sale of royalty rights | $ 150,000,000 |  |
Transaction costs related to sale of potential future royalties | $ 3,800,000 |  |
Payment of transaction related to purchase and sale agreement |  | $ 210,000,000 |
Payment of transaction related to purchase and sale agreement if threshold is not achieved |  | 240,000,000 |
Minimum transaction royalties payments needed to pay the difference between the 2025 threshold and 2020 transaction royalties |  | $ 208,000,000 |

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- Definition Liability related to sale of future royalties. + References No definition available. + Details
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- Definition Minimum Transaction Royalties Payments Needed to Pay the Difference Between Thresholds and Transactions + References No definition available. + Details
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