Commitments - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2021	Dec. 31, 2020
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	$ 594,000	$ 659,000
Lease Payments With in One Year				$ 461
Lease Payments Due Next year			$ 89
Weighted-average discount rate	5.50%
Operating lease weighted-average remaining lease term	12 months
Finance Lease Remaining Lease Term	16 months
Finance lease amortization and interest expense	$ 5,000
Operating Lease Payments	447
Operating Lease, Cost	437
Finance Lease Payments	$ 5,100