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Summary of Significant Accounting Principles (Tables)
12 Months Ended
Dec. 31, 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 
 9.0   2035