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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021
Fair Value Of Financial Instruments [Line Items] |  |  |
Note payable, percentage of hypothetical yield |  |  | 9.0
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% | 2.00% |
Financial liabilities fair value | $ 40.7 | $ 40.8 |
MidCap Credit Facility | Minimum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | 39.0 | 39.1 |
MidCap Credit Facility | Maximum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 42.4 | $ 42.7 |
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% | 2.00% |
Losses on extinguishment of debt |  | $ (22.1) |
Substantial premium based on fair value post modification recognized as additional paid-in capital |  | $ 22.1 |
Mann Group Convertible Notes | Volatility |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Note payable, percentage of volatility | 84.2 | 85 |
Mann Group Convertible Notes | Minimum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 32.8 | $ 36.9 |
Mann Group Convertible Notes | Maximum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 34.6 | $ 38.8 |
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% | 2.00% |
Financial liabilities fair value | $ 221.6 | $ 237.5 |
Senior Convertible Notes | Volatility |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Note payable, percentage of volatility | 83.6 | 90 |
Senior Convertible Notes | Minimum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 211.1 | $ 226.6 |
Senior Convertible Notes | Maximum |  |  |
Fair Value Of Financial Instruments [Line Items] |  |  |
Financial liabilities fair value | $ 233.1 | $ 249.4 |

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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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