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Consolidated Balance Sheet - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Construction in Progress, Gross	[1]	$ 7,343		$ 7,343			$ 12,906
Depreciation		1,800	$ 1,300	3,300	$ 2,600
Software Development [Member]
Construction in Progress, Gross		5,600		5,600		$ 2,100
Casting Machine [Member]
Construction in Progress, Gross						$ 2,100
Marlborough facility [Member]
Construction in Progress, Gross		$ 300		$ 300			$ 7,300
[1] Construction in progress as of June 30, 2019 includes $5.6 million in capitalized internal-use software development costs and $0.3 million in manufacturing improvements at our Rancho Dominguez facility among other projects. 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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- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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