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Revenue Recognition - Summary of Contract Assets Offset with Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Revenue Recognition [Abstract] |  |  |  |
Gross deferred revenue | $ 36,081 | $ 51,694 | $ 45,582 | $ 39,544
Gross contract assets | (11,792) | (19,343) |  |
Deferred revenue, net | $ 24,289 | $ 32,351 |  |

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