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Supplemental Cashflow Information (Schedule of Changes in Liabilities Arising from Financing Activities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Amortization of transaction costs | $ 116 |
Bank Loan |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Liabilities arising from financing activities at beginning of period | 39,871 | $ 39,768
Transaction cost | (1,338) |
Loss on debt modifications | 653 |
Amortization of transaction costs | 116 | 103
Additions included as non-current | 30,000 |
Liabilities arising from financing activities at end of period | 69,302 | 39,871
Loan and lease obligation |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Liabilities arising from financing activities at beginning of period | 906 | 3,034
Principal payments | (1,932) | (2,128)
Additions included as current | 4,295 |
Additions included as non-current | 5,497 |
Liabilities arising from financing activities at end of period | 8,766 | 906
Interest rate swaps |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Liabilities arising from financing activities at beginning of period | (140) | 253
Interest accrued |  | (25)
Settlement of the swap | 228 |
Change in fair value | (312) | (368)
Liabilities arising from financing activities at end of period | $ (224) | $ (140)

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