Balance Sheet Information - Summary of Long-term Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Liabilities Noncurrent [Abstract]
Operating leases	$ 3,810	$ 3,949
Deferred payroll taxes	243	243
Finance leases	117	96
Deferred revenue	65	76
Other	110	23
Total	$ 4,345	$ 4,387