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Revenue Recognition - Summary of Contract Assets Offset with Deferred Revenue Balances (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Revenue Recognition [Abstract]            
Gross deferred revenue $ 35,611 $ 45,801 $ 51,694 $ 58,779 $ 37,260 $ 39,544
Gross contract assets (11,827)   (19,343)      
Deferred revenue, net $ 23,784   $ 32,351