Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net of Accumulated Depreciation (Detail)

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Property and Equipment, Net of Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 3,000 $ 3,200
Less accumulated depreciation (1,400) (1,700)
Property and equipment, net $ 1,603 $ 1,474