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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	0.10
Loss on extinguishment of debt		$ (17,200)	$ (264)
MidCap Credit Facility
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	12	10
Note payable, percentage of interest rate increases (decreases)	2.00%	2.00%
Financial liabilities fair value	$ 41,100	$ 40,800
MidCap Credit Facility | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	40,000	39,100
MidCap Credit Facility | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 42,400	$ 42,700
Mann Group Convertible Note
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	13	12
Note payable, percentage of interest rate increases (decreases)	2.00%	2.00%
Loss on extinguishment of debt	$ (22,100)	$ (22,100)
Substantial premium based on fair value post modification recognized as additional paid-in capital	$ 22,100	$ 22,100
Mann Group Convertible Note | Volatility
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of volatility	77.8	85
Mann Group Convertible Note | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 20,500	$ 36,900
Mann Group Convertible Note | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 21,200	$ 38,800
Senior Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	13	12
Note payable, percentage of interest rate increases (decreases)	2.00%	2.00%
Financial liabilities fair value	$ 253,900	$ 237,500
Senior Convertible Notes | Volatility
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of volatility	75.8	90
Senior Convertible Notes | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 245,000	$ 226,600
Senior Convertible Notes | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 263,400	$ 249,400

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Fair value of financial instruments.

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- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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