Quarterly report pursuant to Section 13 or 15(d)

Consolidated Financial Statements Details - Summary of Property Equipment and Improvements, Net (Detail)

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Consolidated Financial Statements Details - Summary of Property Equipment and Improvements, Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Property and equipment $ 1,318 $ 378
Leasehold improvements 2,422 27
Construction in progress   435
Property, equipment and improvements, gross 3,740 840
Less: accumulated depreciation (375) (160)
Property, equipment and improvements, net $ 3,365 $ 680