Leases - Summary of Maturities of Lease Liabilities (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Lessee Disclosure [Abstract]
Operating Leases 2019 (excluding the 3 months ended March 31, 2019)	$ 199
Operating Leases 2020	266
Operating Leases 2021	162
Operating Leases 2022	84
Operating Leases Total lease payments	711
Operating Leases Less: Imputed interest	(68)
Lease liabilities	643
Finance Leases 2019 (excluding the 3 months ended March 31, 2019)	1
Finance Leases 2020	1
Finance Leases 2021	1
Finance Leases 2022	1
Finance Leases 2023	1
Finance Leases Thereafter	1
Finance Leases Total lease payments	6
Finance Leases Less: Imputed interest	(1)
Finance Leases Total	$ 5