Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets, Net - Summary of Changes in Carrying Amount of Goodwill (Detail)

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Goodwill and Intangible Assets, Net - Summary of Changes in Carrying Amount of Goodwill (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Balance as of December 31, 2017 $ 139
Acquisitions 27,603
Adjustments (134)
Balance as of September 30, 2018 $ 27,608