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Other Long-Term Obligations and Commitments - Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]    
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 $ 328,000 $ 331,000
Lease Payments With in One Year 299,000  
Lease payments due next year 158,000  
Lease payments due next two years $ 17,000  
Weighted-average discount rate 5.50%  
Operating lease weighted-average remaining lease term 14 months 15 days  
Finance lease remaining lease term month year April 2021  
Finance lease amortization and interest expense $ 2,302,000  
Operating lease payments 300,000  
Operating lease cost 287,000  
Finance lease payments $ 2,552,000