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Consolidated Balance Sheet - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Construction in Progress, Gross | [1] | $ 5,721 |  | $ 5,721 |  | $ 12,906
Depreciation |  | 1,800 | $ 1,300 | 5,200 | $ 3,900 |
Furniture And Fixture [Member] |  |  |  |  |  |
Construction in Progress, Gross |  | 6,500 |  | 6,500 |  |
Software Development [Member] |  |  |  |  |  |
Construction in Progress, Gross |  |  |  |  |  | 2,100
Marlborough facility [Member] |  |  |  |  |  |
Construction in Progress, Gross |  |  |  |  |  | $ 7,300
Waltham And Rancho Facilities [Member] |  |  |  |  |  |
Construction in Progress, Gross |  | $ 4,900 |  | $ 4,900 |  |
[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.

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