Leases - Supplemental Balance Sheet Related to Finance Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Property and equipment, at cost	$ 270	$ 371
Accumulated amortization	(138)	(205)
Property and equipment, net	132	166
Other current liabilities – finance lease current portion	$ 122	$ 137
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Other long-term liabilities	$ 18	$ 36
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities
Total finance lease liabilities	$ 140	$ 173