Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Individual assets excluding computer equipment
Property, Plant and Equipment [Line Items]
Capitalization threshold, minimum useful life	1 year
Capitalization threshold, minimum cost	$ 5,000
Assets purchased in bulk
Property, Plant and Equipment [Line Items]
Capitalization threshold, minimum cost	5,000
Buildings | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	P25Y
Buildings | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	P33Y
Tooling and equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Tooling and equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Computer equipment
Property, Plant and Equipment [Line Items]
Capitalization threshold, minimum useful life	1 year
Capitalization threshold, minimum cost	$ 1,000
Computer equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Software | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Software | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Furniture and fixtures | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Furniture and fixtures | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	8 years
Leasehold and building improvements | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Leasehold and building improvements | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years