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Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Land $ 1,023 $ 1,023
Buildings 764 764
Leasehold improvements 22,953 16,259
Equipment 31,144 24,092
Furniture and fixtures 14,214 5,448
Construction in progress [1] 5,721 12,906
Other 50  
Total property, plant and equipment 75,869 60,492
Less - Accumulated depreciation (32,835) (28,312)
Total property, plant and equipment, net $ 43,034 $ 32,180
[1] Construction in progress as of September 30, 2019, includes $4.9 million, which is primarily related to various manufacturing expansion projects at our Waltham, Massachusetts and Rancho Dominguez, California facilities. Construction in progress as of December 31, 2018 includes $2.1 million of capitalized internal-use software development costs and $7.3 million for the buildout of our Marlborough, Massachusetts facility. Both projects have since been placed into service and as a result, $6.5 million of internal-use software development costs are now included in furniture and fixtures as of September 30, 2019.