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Liability Related to Sale of Future Royalties - Additional Information (Detail) - USD ($) $ in Millions | 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 |  |  | $ 124.0
Transaction costs related to sale of potential future royalties |  |  | $ 4.4
2020 Purchase and Sale Agreement |  |  |
Liability Related to Sale of Future Royalties [Line Items] |  |  |
Proceeds from sale of royalty rights | $ 150.0 |  |
Transaction costs related to sale of potential future royalties | $ 3.8 |  |
Payment of transaction related to purchase and sale agreement |  | $ 210.0 |
Payment of transaction related to purchase and sale agreement if threshold is not achieved |  | 240.0 |
Minimum transaction royalties payments needed to pay the difference between the 2025 threshold and 2020 transaction royalties |  | $ 208.0 |

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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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- Details
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