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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Note payable, percentage of hypothetical yield |  | 10 |  |
Gain (loss) on extinguishment of debt, net | $ 4,930 |  | $ (17,200) |
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 |  | $ 40,700 |  | $ 40,800
MidCap Credit Facility | Minimum |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Financial liabilities fair value |  | 39,500 |  | 39,100
MidCap Credit Facility | Maximum |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Financial liabilities fair value |  | $ 42,100 |  | $ 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%
Gain (loss) on extinguishment of debt, net |  |  |  | $ (22,100)
Substantial premium based on fair value post modification recognized as additional paid-in capital |  |  |  | $ 22,100
Mann Group Convertible Note | Volatility |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Note payable, percentage of volatility |  | 75.8 |  | 85
Mann Group Convertible Note | Minimum |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Financial liabilities fair value |  | $ 12,900 |  | $ 36,900
Mann Group Convertible Note | Maximum |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Financial liabilities fair value |  | $ 13,700 |  | $ 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 |  | $ 206,100 |  | $ 237,500
Senior Convertible Notes | Volatility |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Note payable, percentage of volatility |  | 74.7 |  | 90
Senior Convertible Notes | Minimum |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Financial liabilities fair value |  | $ 196,800 |  | $ 226,600
Senior Convertible Notes | Maximum |  |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |  |
Financial liabilities fair value |  | $ 216,200 |  | $ 249,400

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