Leases - Schedule of Classification of ROU Assets and Lease liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Operating right-of-use assets	$ 2,381	$ 2,272
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other noncurrent assets	Other noncurrent assets
Finance right-of-use assets	$ 186	$ 157
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other noncurrent assets	Other noncurrent assets
Total leased assets	$ 2,567	$ 2,429
Current
Operating leases	$ 450	$ 269
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued liabilities	Accrued liabilities
Finance leases	$ 75	$ 68
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued liabilities	Accrued liabilities
Noncurrent
Operating leases	$ 3,810	$ 3,949
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term liabilities	Long-term liabilities
Finance leases	$ 117	$ 96
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term liabilities	Long-term liabilities
Total lease liabilities	$ 4,452	$ 4,382