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Future Operating Lease Payment Obligations and Future Minimum Lease Payments under Capital Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Operating leases
Rest of 2019	$ 356
2019		$ 1,372
2020	1,338	1,138
2021	1,168	969
2022	887	689
2023	587	390
2024-2028	400	120
Total Payments	4,736	4,678
Less: Interest	507
Amount of Lease Obligations Recorded on Consolidated Balance Sheets	4,229
Capital lease
Rest of 2019	80
2019		3,069
2020	262	2,535
2021	161	93
2022	97	32
2023	55	14
Total Payments	655	5,743
Less: Interest	35
Amount of Lease Obligations Recorded on Consolidated Balance Sheets	$ 620	$ 5,800	$ 6,500

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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