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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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Schedule of Estimated Useful Lives and Depreciation Calculation Methods | Depreciation is calculated at annual rates designed to write off the costs of assets over their estimated useful lives as follows:
Engineering equipment |  | 5 to 10 years |  | straight-line |  |
Office equipment |  | 5 to 10 years |  | straight-line |  |
Leasehold improvements |  |  |  | straight-line over term of lease to a maximum of 15 years or the improvement’s economic life |  |
Other |  | 5 to 50 years |  | straight-line |  |

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