Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating Leases
Operating lease right-of-use assets	$ 1,040	$ 1,308
Total operating lease liabilities	1,593	2,004
Finance Leases
Property and equipment, net	1,515	1,849
Total finance lease liabilities	$ 15	$ 34
Weighted Average Remaining Lease Term
Operating leases	2 years 180 days	3 years 108 days
Finance leases	216 days	1 year 144 days
Weighted Average Discount Rate
Operating leases	6.00%	6.00%
Finance leases	13.80%	13.80%
Finance Lease
Finance Leases
Property and equipment, at cost	$ 66
Accumulated depreciation	(36)
Property and equipment, net	30
Finance Lease
Finance Leases
Property and equipment, at cost		$ 66
Accumulated depreciation		(25)
Property and equipment, net		41
Other Current Liabilities
Operating Leases
Total operating lease liabilities	671	656
Finance Leases
Total finance lease liabilities	15	25
Other Noncurrent Liabilities
Operating Leases
Total operating lease liabilities	922	1,348
Finance Leases
Total finance lease liabilities	0	9
Operating Lease Liabilities
Operating Leases
Total operating lease liabilities	$ 1,593	$ 2,004