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Leases - Additional information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases right of use assets	$ 4,348,000	$ 4,348,000	$ 4,329,000
Short-term lease liabilities	1,580,000	1,580,000
Long-term lease liabilities	2,845,000	2,845,000		$ 102,000
Short-term lease cost	$ 461,000	$ 1,398,000
Weighted-average remaining lease term	3 years 10 months 24 days	3 years 10 months 24 days
Weighted-average discount rate	3.81%	3.81%
Additional interest factor		1.375%
Lease liabilities paid	$ 44,000	$ 107,000
ROU assets in exchange for new operating lease liabilities	951,000	1,413,000
Lease income	$ 214,000	$ 642,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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