Lease Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Operating Leases
Operating lease right-of-use assets	$ 1,308	$ 0
Total operating lease liabilities	2,004
Finance Leases
Property and equipment, at cost	15,392	15,457
Accumulated depreciation	(13,543)	(12,464)
Property and equipment, net	1,849	$ 2,993
Total finance lease liabilities	$ 34
Weighted Average Remaining Lease Term
Operating leases	3 years
Finance leases	1 year
Weighted Average Discount Rate
Operating leases	6.00%
Finance leases	13.80%
Finance Lease [Member]
Finance Leases
Property and equipment, at cost	$ 66
Accumulated depreciation	(25)
Property and equipment, net	41
Other Noncurrent Liabilities [Member]
Finance Leases
Total finance lease liabilities	25
Other Current Liabilities [Member]
Operating Leases
Total operating lease liabilities	656
Finance Leases
Total finance lease liabilities	9
Operating Lease Liabilities [Member]
Operating Leases
Total operating lease liabilities	$ 1,348