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Revenue From Contracts With Customers - Schedule of Deferred Revenue by Arrangement (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Change In Contract With Customer Liability [Abstract]
Deferred revenue, current	$ 9,136	$ 11,322	$ 12,842
Long-term deferred revenue	$ 3,335	$ 3,126

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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-Publisher FASB
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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