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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
MidCap Credit Facility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 12 | 12
Note payable, percentage of interest rate increases (decreases) | 2.00% | 2.00%
MidCap Credit Facility | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 29.7 | $ 35.0
MidCap Credit Facility | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 30.4 | $ 36.0
Mann Group Convertible Notes |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 13 | 13
Note payable, percentage of interest rate increases (decreases) | 2.00% | 2.00%
Mann Group Convertible Notes | Volatility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 55.6 | 62.7
Mann Group Convertible Notes | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 16.9 | $ 14.2
Mann Group Convertible Notes | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 17.4 | $ 14.7
Senior Convertible Notes |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 11 | 11
Note payable, percentage of interest rate increases (decreases) | 2.00% | 2.00%
Senior Convertible Notes | Volatility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 59.9 | 62.7
Senior Convertible Notes | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 239.8 | $ 224.1
Senior Convertible Notes | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 253.3 | $ 238.9
Financing Liability |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 9.5 | 9.5
Note payable, percentage of interest rate increases (decreases) | 2.00% |
Financing Liability | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 94.0 |
Financing Liability | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 122.4 |
Milestone Rights | Risk-Free Rate |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 4.2 | 3.88
Milestone Rights | Dividend Yield |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 0 | 0
Milestone Rights | Volatility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 50 | 50
Milestone Rights | Period |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 7.75 | 8
Milestone Rights | Credit Risk |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 17 | 17
Contingent Milestone Liability | Risk-Free Rate |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 4.29 | 4.01
Contingent Milestone Liability | Dividend Yield |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 0 | 0
Contingent Milestone Liability | Volatility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 43 | 43
Contingent Milestone Liability | Period |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 13.75 | 15
Contingent Milestone Liability | Credit Risk |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, fair value key inputs | 17 | 17
Liability for Sale of Future Royalties |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 11 |
Note payable, percentage of interest rate increases (decreases) | 2.00% |
Liability for Sale of Future Royalties | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 139.6 |
Liability for Sale of Future Royalties | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 184.4 |

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