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Leases - Components of lease costs and supplemental information related to leases (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lease Assets and Liabilities
ROU assets	$ 17,340	$ 17,340
Total lease liabilities	20,558	20,558
Lease Cost
Operating lease expense	1,628	5,634
Total lease expense	1,628	5,634
Other Information
Operating cash outflows from operating leases	$ 1,640	$ 6,499
Lease Term and Discount Rate
Weighted average remaining lease term (years)	4 years 3 months 3 days	4 years 3 months 3 days
Weighted average discount rate	3.46%	3.46%

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Amount of lease cost recognized by lessee for lease contract.

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Amount of operating lease expense. Excludes sublease income.

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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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