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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
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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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