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Summary of Significant Accounting Policies - Useful Life (Details)	12 Months Ended
	Dec. 31, 2016
Building
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	39 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Tooling
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	6 years
Furniture and office equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Furniture and office equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	6 years
Demonstration Units [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Land, Buildings and Improvements [Member] | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Land, Buildings and Improvements [Member] | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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