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Borrowings - Mann Group Promissory Notes - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Apr. 22, 2021 USD ($) | Mar. 31, 2021 USD ($) $ / shares | Aug. 31, 2019 USD ($) $ / shares | Mar. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 338.4 |  | $ 338.4 |
Debt issuance amount |  | 230.0 |  |  |
Mann Group | Convertible Promissory Note |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 18.4 |  | $ 18.4 | $ 28.0
Senior notes, effective interest rate |  | 7.00% |  | 7.00% |
Conversion price of shares | $ / shares |  | $ 2.50 |  | $ 2.50 |
Debt issuance amount |  |  |  | $ 9.6 | $ 7.0
Conversion of notes to common shares, shares | shares |  |  |  | 4,000,000 | 2,800,000
Mann Group | Convertible Promissory Note | Accrued Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance amount |  |  |  | $ 0.4 | $ 3.0
Conversion of notes to common shares, shares | shares |  |  |  |  | 1,200,000
Mann Group | Convertible Promissory Note | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt | $ 35.1 |  |  |  |
Mann Group | New Loan Arrangement | Convertible Promissory Note |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
No of convertible shares |  |  | 400 |  |
Principal amount per share | $ / shares |  |  | $ 1,000 |  |
Conversion price of shares | $ / shares |  |  | $ 2.50 |  |
Mann Group | New Loan Arrangement | Promissory Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes, effective interest rate |  |  | 7.00% |  |
Debt instrument payment term description |  |  | quarterly |  |
Debt instrument, date of first required interest payment |  |  | Oct. 01, 2019 |  |
Maturity date |  |  | Nov. 03, 2024 |  |
Mann Group | New Loan Arrangement | Promissory Notes | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes, effective interest rate | 2.50% |  |  |  |
Maturity date | Dec. 31, 2025 |  |  |  |
Mann Group | Privately Negotiated Exchange Agreement | Loan Arrangement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Common stock price per share | $ / shares |  |  | $ 2.50 |  |
Mann Group | Privately Negotiated Exchange Agreement | Loan Arrangement | Convertible Promissory Note |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  | $ 35.0 |  |
Mann Group | Privately Negotiated Exchange Agreement | Loan Arrangement | Non-Convertible Note |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  | $ 35.1 |  |

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