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Consolidated Financial Statements Details - Summary of Property Equipment and Improvements, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Property and equipment $ 539 $ 378
Leasehold improvements 1,994 27
Construction in progress   435
Property, equipment and improvements, gross 2,533 840
Less: accumulated depreciation (209) (160)
Property, equipment and improvements, net $ 2,324 $ 680