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Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Land $ 1,023  
Buildings 764  
Leasehold improvements 15,673 $ 14,592
Equipment 21,904 15,214
Furniture and fixtures 4,272 3,218
Construction in progress 2,581 1,264
Total property, plant and equipment 46,217 34,288
Less: accumulated depreciation (23,800) (19,332)
Property, plant and equipment, net $ 22,417 $ 14,956