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Other Long-Term Obligations and Commitments - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 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 $ 162,000 $ 163,000
Lease Payments With in One Year 599,000  
Lease payments due next year 157,000  
Lease payments due next two years $ 17,000  
Weighted-average discount rate 5.50%  
Operating lease weighted-average remaining lease term 17 months 15 days  
Finance lease remaining lease term 13 months  
Finance lease amortization and interest expense $ 1,828,000  
Operating lease payments 151,000  
Operating lease cost 140,000  
Finance lease payments $ 1,913,000