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Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Land $ 1,021  
Buildings 768  
Leasehold improvements 15,743 $ 14,592
Equipment 19,543 15,214
Furniture and fixtures 4,111 3,218
Construction in progress 3,286 1,264
Total property, plant and equipment 44,472 34,288
Less: accumulated depreciation (22,416) (19,332)
Property, plant and equipment, net $ 22,056 $ 14,956