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Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Land $ 1,023 $ 1,023
Buildings 764 764
Leasehold improvements 15,740 15,673
Equipment 22,497 21,904
Furniture and fixtures 4,605 4,272
Construction in progress 3,052 2,581
Total property, plant and equipment 47,681 46,217
Less: accumulated depreciation (25,007) (23,800)
Property, plant and equipment, net $ 22,674 $ 22,417