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Leases - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Lessee Lease Description [Line Items]
Total lease expense	$ 374,000
Rent expense		$ 286,000
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Weighted average remaining operating lease term	3 years 10 months 24 days
Weighted average discount rate of operating lease	6.40%
Sublease rental income due in future under non-cancelable subleases	$ 2,400,000
Operating lease liabilities, cash paid	500,000
Sublease rental income	$ 200,000
Minimum
Lessee Lease Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee Lease Description [Line Items]
Remaining lease term	7 years
Operating leases, options to extend leases term	5 years

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Indicates (true false) whether lessee has option to extend operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of operating lease expense. Excludes sublease income.

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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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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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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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