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Basis of Preparation (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Schedule of Estimated Useful Lives and Depreciation Rates | Based on a review of the underlying nature, physical use, and technological lives of certain property and equipment, effective January 1, 2017, depreciation is calculated at annual rates designed to write off the costs of assets over their estimated useful lives on a straight-line basis as follows:
|  | Estimated lives |  | Declining balance prior to 2017 |  |
Engineering equipment |  | 5 to 10 years |  | 20% to 30% |  |
Office equipment |  | 5 to 10 years |  | 20% to 30% |  |
Other |  | 5 to 50 years |  | 10% to 30% |  |

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