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Changes in Deferred Revenue (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Revenue From Contract With Customer [Abstract]  
Deferred revenue $ 2,810
Fair value of deferred revenue acquired in acquisition, net of recognition 11
Deferral of revenue billed in current period, net of recognition 2,297
Recognition of revenue deferred in prior periods (1,406)
Deferred revenue $ 3,712