Leases - Balance Sheet Classification and Amounts of Right-of-Use Assets and Lease Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 01, 2019
Right-of-use assets
Other assets	$ 1,696	$ 1,700
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Operating lease liabilities:
Other accrued liabilities	$ 472
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent
Other long-term liabilities	$ 2,394
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Total operating lease liabilities	$ 2,866	$ 2,900