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Commitments - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2021
Lease period description The Company leases office facilities under operating leases and recognizes lease expense on a straight-line basis over the lease term. Leases assets and liabilities are initially recorded at commencement date based on the present value of lease payments over the lease term.      
Rent expense for office space $ 663,000 $ 594,000 $ 0  
Lease Payments With in One Year $ 461,000      
Lease Payments Due Next year       $ 89,000
Weighted-average discount rate 5.50%      
Operating lease weighted-average remaining lease term 2 months 15 days      
Finance Lease Remaining Lease Term 4 months      
Finance lease amortization and interest expense $ 7,165,000      
Operating Lease Payments 616,000      
Operating Lease, Cost 574,000      
Finance Lease Payments $ 7,655,000