Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Prinicples (Tables)

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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