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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
MidCap Credit Facility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 12.5 | 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 | $ 39.4 | $ 40.0
MidCap Credit Facility | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 40.7 | $ 42.4
Mann Group Convertible Note |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 13.5 | 13
Note payable, percentage of interest rate increases (decreases) | 2.00% | 2.00%
Mann Group Convertible Note | Volatility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of volatility | 60.9 | 77.8
Mann Group Convertible Note | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 15.6 | $ 20.5
Mann Group Convertible Note | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 16.1 | $ 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, percentage of volatility | 61.8 | 75.8
Senior Convertible Notes | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 229.4 | $ 245.0
Senior Convertible Notes | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 245.7 | $ 263.4
Financing Liability |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 10.5 | 10

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- Definition Fair value of financial instruments. + References No definition available. + Details
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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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition 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. + References No definition available. + Details
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