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

Other (Expense)/Income - Summary of Other Nonoperating Income (Expense) (Detail)

v3.21.2
Other (Expense)/Income - Summary of Other Nonoperating Income (Expense) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 09, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Non Operating Expense Income [Line Items]              
Other Nonoperating Income (Expense)   $ (365) $ (155) $ (147,735) $ 126 $ 103 $ (190)
Gain (Loss) on Extinguishment of Debt $ 12     (75) 284 $ 284 $ (3,267)
Amortization of Debt Issuance Costs   0 0 (47,718) 0    
Other Income (Expense)   1 (155) 18 126    
Increase (Decrease) in Derivative Liabilities   (291) 0 (291) 0    
Tranche One Of Bridge Notes [Member]              
Non Operating Expense Income [Line Items]              
Loss On Issuance Of Debt   0 0 (84,291) 0    
Tranche Two Of Bridge Notes Member [Member]              
Non Operating Expense Income [Line Items]              
Loss On Issuance Of Debt   0 0 (12,185) 0    
Rights Offering [Member]              
Non Operating Expense Income [Line Items]              
Loss On Issuance Of Debt   0 0 (3,193) 0    
Bridge Notes Payable [Member]              
Non Operating Expense Income [Line Items]              
Gain (Loss) on Extinguishment of Debt   $ (75) $ 0 $ (75) $ 0