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, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 3,200 $ 2,700
Less accumulated depreciation (1,700) (1,500)
Property and equipment, net $ 1,474 $ 1,247