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Leases - Schedule of Minimum Lease Payments by Period Expected (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Finance Lease Liabilities, Payments, Due [Abstract]
2019 (excluding the nine months ended September 30, 2019)	$ 120
2020	454
2021	325
2022	324
2023	94
Thereafter	4
Total Minimum Finance Lease Payments	1,321
Less: imputed interest	(53)
Present Value of Finance Lease Liabilities	1,268
Operating Lease Liabilities, Payments Due [Abstract]
2019 (excluding the nine months ended September 30, 2019)	231
2020	951
2021	923
2022	898
2023	542
Thereafter	807
Total Minimum Operating Lease Payments	4,352
Less: imputed interest	(538)
Present Value of Operating Lease Liabilities	$ 3,814

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