General form of registration statement for all companies including face-amount certificate companies

Debt and Other Financing - Schedule of Debt Instrument Carrying Amount (Parenthetical) (Detail)

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Debt and Other Financing - Schedule of Debt Instrument Carrying Amount (Parenthetical) (Detail) - 2021 Convertible Bridge Notes [Member]
$ in Millions
Jun. 30, 2021
USD ($)
Mithril II LLP [Member]  
Short-term Debt [Line Items]  
Debt instrument face value $ 15
VCVC [Member]  
Short-term Debt [Line Items]  
Debt instrument face value $ 5