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Borrowings - Summary of Carrying Amount of Principal Borrowings (Parenthetical) (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($)
Debt Instrument [Line Items] |  |
Loss on extinguishment of debt, net | $ (4,930) | $ 17,200
Promissory Notes | Mann Group |  |
Debt Instrument [Line Items] |  |
Debt premium recognized in additional paid-in capital | 22,100 | 22,100
Loss on extinguishment of debt, net | $ 22,100 | $ 22,100

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