Leases - Schedule of Future Minimum Lease Payments under Operating and Finance Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Leases
2019	$ 703
2020	379
2021	104
2022	106
2023	107
Thereafter	137
Total minimum payments required	1,536
Less: amount representing interest	98
Present value of net minimum lease payments	1,438
Less: Current maturities of lease obligations	(876)	$ 0
Long-Term lease obligations	562	0
Finance Leases
2019	69
2020	61
2021	48
2022	23
2023	8
Thereafter	0
Total minimum payments required	209
Less: amount representing interest	12
Present value of net minimum lease payments	197
Less: Current maturities of lease obligations	(80)	(91)
Long-Term lease obligations	$ 117	$ 132