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Revenue Recognition - Summary of Contract Assets Offset with Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Revenue Recognition [Abstract] |  |  |  |
Gross deferred revenue | $ 58,779 | $ 37,260 | $ 39,544 | $ 39,544
Gross contract assets | (35,791) |  | (9,984) |
Deferred revenue, net | $ 22,988 |  | $ 29,560 | $ 22,897

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