Quarterly report pursuant to Section 13 or 15(d)

Acquisition - Summary of Net Change in Carrying Value of Other Intangible Assets (Detail)

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Acquisition - Summary of Net Change in Carrying Value of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance $ 0 $ 0
Additions from acquisition 1,571 0
Amortization (30) 0
Ending balance $ 1,541 $ 0