Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Prinicples (Details)

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Summary of Significant Accounting Prinicples (Details)
3 Months Ended
Mar. 31, 2015
Buildings [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 15 - 30 years
Leasehold improvements [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 7 years
Software [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 - 6 years
Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Vehicles and prototypes [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 - 5 years