Leases - Schedule of Future Principal Minimum Lease Payments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Operating Leases
2019	$ 1,083
2020	597
2021	374
2022	237
2023	77
And subsequent	329
Total undiscounted lease payments	2,697
Less interest	(213)
Total liabilities	2,484
Less current maturities	(985)
Non-current operating lease liabilities	1,499
Capital Leases
2019	1,060
2020	960
2021	898
2022	925
2023	952
And subsequent	3,656
Total undiscounted lease payments	8,451
Less interest	(3,278)
Total liabilities	5,173
Less current maturities	(462)	$ (422)
Finance lease obligations (net of current portion)	$ 4,711	$ 5,061