Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Balance as of December 31, 2017 $ 139
Acquisitions 5,370
Balance as of December 31, 2018 $ 5,509