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Consolidated Balance Sheet - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Construction in Progress, Gross | [1] | $ 6,826 |  |  | $ 12,906
Depreciation |  | $ 1,600 | $ 1,300 |  |
Software Development [Member] |  |  |  |  |
Construction in Progress, Gross |  |  |  | $ 2,100 |
Casting Machine [Member] |  |  |  |  |
Construction in Progress, Gross |  |  |  | $ 2,100 |
Marlborough facility [Member] |  |  |  |  |
Construction in Progress, Gross |  |  |  |  | $ 7,300
[1] | Construction in progress as of December 31, 2018 included $7.3 million for the buildout of our Marlborough facility, which was put into service and began depreciating on January 1, 2019, $2.1 million in capitalized internal-use software development costs and $2.1 million for a casting machine, among other projects.

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