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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Fair Value Of Financial Instruments [Line Items] |  |
Loss on extinguishment of debt | $ (17,200) | $ (264)
MidCap Credit Facility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 10 |
Note payable, percentage of interest rate increases (decreases) | 2.00% |
Financial liabilities fair value | $ 40,800 | 55,400
MidCap Credit Facility | Carrying Value |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | 38,800 | 49,300
MidCap Credit Facility | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | 39,100 |
MidCap Credit Facility | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 42,700 |
Mann Group Convertible Notes |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 12 |
Note payable, percentage of interest rate increases (decreases) | 2.00% |
Loss on extinguishment of debt | $ (22,100) |
Substantial premium based on fair value post modification recognized as additional paid-in capital | $ 22,100 |
Mann Group Convertible Notes | Volatility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of volatility | 85 |
Mann Group Convertible Notes | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 36,900 |
Mann Group Convertible Notes | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 38,800 |
Senior Convertible Notes |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of hypothetical yield | 12 |
Note payable, percentage of interest rate increases (decreases) | 2.00% |
Financial liabilities fair value | $ 237,500 |
Senior Convertible Notes | Carrying Value |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 223,900 |
Senior Convertible Notes | Volatility |  |
Fair Value Of Financial Instruments [Line Items] |  |
Note payable, percentage of volatility | 90 |
Senior Convertible Notes | Minimum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 226,600 |
Senior Convertible Notes | Maximum |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | 249,400 |
Mann Group Convertible Notes |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | 37,800 | 52,200
Mann Group Convertible Notes | Carrying Value |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value | $ 18,400 | 28,000
Mann Group Non Convertible Notes |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value |  | 26,700
Mann Group Non Convertible Notes | Carrying Value |  |
Fair Value Of Financial Instruments [Line Items] |  |
Financial liabilities fair value |  | $ 35,100

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