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Revenue Recognition - Summary of Contract Assets Offset with Deferred Revenue Balances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue Recognition [Abstract]      
Gross deferred revenue $ 51,694 $ 39,544 $ 39,544
Gross contract assets (19,343) (9,984)  
Deferred revenue, net $ 32,351 $ 29,560 $ 22,897