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Consolidated Balance Sheet Detail (Detail textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Construction in Progress, Gross | [1] | $ 12,906 | $ 2,581 |
Depreciation |  | 5,200 | 4,200 | $ 3,300
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 includes $7.3 million for the buildout of our Marlborough facility, $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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