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Summary of Significant Accounting Prinicples (Tables)
6 Months Ended
Jun. 30, 2015
Summary of Significant Accounting Principles [Abstract]  
Schedule of estimated useful lives

Buildings:  15 - 30 years

Leasehold improvements:  7 years

Software:  3 - 6 years

Equipment:  5 years

Vehicles and prototypes:  3 - 5 years

Income taxes
Approximate net
operating loss
($ millions)
 Carryover to be used
against taxable income
generated through year
   
3.6 2030
6.7 2031
3.9 2032
4.7 2033
6.1 2034
3.7 2035