Summary of Significant Accounting Policies-Useful Life (Details)	12 Months Ended
	Jan. 03, 2015
Building
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	39 years
Building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 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