Leases - Supplemental Balance Sheet Related to Finance Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Leases [Abstract]
Property and equipment, at cost	$ 270	$ 371
Accumulated amortization	(206)	(205)
Property and equipment, net	64	166
Other current liabilities – finance lease current portion	$ 70	$ 137
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Other long-term liabilities		$ 36
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities
Total finance lease liabilities	$ 70	$ 173