Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Operating Leases
Operating lease right-of-use assets	$ 851	$ 946
Total operating lease liabilities	1,304	1,450
Finance Leases
Property and equipment, net	2,245	1,883
Total finance lease liabilities	$ 67	$ 75
Weighted Average Remaining Lease Term
Operating leases	2 years	2 years 108 days
Finance leases	1 year 252 days	2 years
Weighted Average Discount Rate
Operating leases	6.00%	6.00%
Finance leases	6.30%	6.30%
Finance Lease
Finance Leases
Property and equipment, at cost	$ 112
Accumulated depreciation	(35)
Property and equipment, net	77
Finance Lease
Finance Leases
Property and equipment, at cost		$ 112
Accumulated depreciation		(28)
Property and equipment, net		84
Other Current Liabilities
Operating Leases
Total operating lease liabilities	680	676
Finance Leases
Total finance lease liabilities	28	31
Other Noncurrent Liabilities
Operating Leases
Total operating lease liabilities	624	774
Finance Leases
Total finance lease liabilities	39	44
Operating Lease Liabilities
Operating Leases
Total operating lease liabilities	$ 1,304	$ 1,450