Leases - Summary of Remaining Lease Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Operating Leases
2019	$ 505
2020	1,863
2021	1,654
2022	1,333
2023	250
Thereafter	782
Total undiscounted value of lease liabilities	6,387
Less: Interest	(384)
Present value of lease liabilities	6,003	$ 20,500
Current portion of lease liabilities	1,798
Long-term portion of lease liabilities	4,205
Total lease liabilities	6,003	$ 20,500
Finance Leases
2019	321
2020	1,013
2021	1,414
2022	1,442
2023	1,471
Thereafter	27,207
Total undiscounted value of lease liabilities	32,868
Less: Interest	(11,808)
Present value of lease liabilities	21,060
Current portion of lease liabilities	293
Long-term portion of lease liabilities	20,767
Total lease liabilities	$ 21,060