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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Fair Value Of Financial Instruments [Line Items] |  |  |
Loss on extinguishment of debt | $ (22,130) | $ (22,130) |
MidCap Credit Facility |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Note payable, percentage of hypothetical yield | 10 | 10 |
Note payable, percentage of interest rate increases (decreases) |  | 2.00% |
Financial liabilities fair value | $ 40,500 | $ 40,500 | $ 55,400
MidCap Credit Facility | Carrying Value |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | 38,600 | 38,600 | 49,300
MidCap Credit Facility | Minimum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | 38,500 | 38,500 |
MidCap Credit Facility | Maximum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 42,700 | $ 42,700 |
Mann Group Convertible Notes |  |  |
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% |
Loss on extinguishment of debt |  | $ (22,100) |
Substantial premium based on fair value post modification recognized as additional paid-in capital | $ 22,100 | $ 22,100 |
Mann Group Convertible Notes | Volatility |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Note payable, percentage of volatility | 96 | 96 |
Mann Group Convertible Notes | Minimum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 43,900 | $ 43,900 |
Mann Group Convertible Notes | Maximum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 45,900 | $ 45,900 |
PPP Loan |  |  |
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% |
PPP Loan | Minimum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 4,700 | $ 4,700 |
PPP Loan | Maximum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 4,800 | $ 4,800 |
Senior Convertible Notes |  |  |
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% |
Financial liabilities fair value | $ 257,000 | $ 257,000 |
Senior Convertible Notes | Carrying Value |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 223,200 | $ 223,200 |
Senior Convertible Notes | Volatility |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Note payable, percentage of volatility | 96 | 96 |
Senior Convertible Notes | Minimum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 245,400 | $ 245,400 |
Senior Convertible Notes | Maximum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | 269,800 | 269,800 |
Mann Group Convertible Notes |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | 44,900 | 44,900 | 52,200
Mann Group Convertible Notes | Carrying Value |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 18,400 | $ 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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