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Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Summary of Depreciation on Property and Equipment | Depreciation is recorded on a straight-line basis over the following periods:
Computer equipment |  | 3 years
Furniture and fixtures |  | 5 years
Machinery and equipment |  | 5 - 10 years
Leasehold improvements and equipment under capital lease |  | Over the term of the lease

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