Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
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	$ 35.0	$ 40.0
MidCap Credit Facility | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 36.0	$ 42.4
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	62.7	77.8
Mann Group Convertible Notes | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 14.2	$ 20.5
Mann Group Convertible Notes | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 14.7	$ 21.2
Senior Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	11	13
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	62.7	75.8
Senior Convertible Notes | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 224.1	$ 245.0
Senior Convertible Notes | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 238.9	$ 263.4
Milestone Rights | Risk-Free Rate
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	3.88	3.99
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	8	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	4.01	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	15	15
Contingent Milestone Liability | Credit Risk
Fair Value Of Financial Instruments [Line Items]
Note payable, fair value key inputs	17	17
Financing Liability
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	9.5	10