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Other information | 12 Months Ended
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Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract] |
Other information | Other information a) Supplemental cash flow information
Year ended December 31, |  | 2016 |  |  | 2015 |
Cash paid during the year for: |  |  |  |
Interest |  | $ | 5,895 |  |  | $ | 9,187 |
Income taxes |  | — |  |  | — |
Cash received during the year for: |  |  |  |
Interest |  | 194 |  |  | 208 |
Income taxes |  | — |  |  | — |
Year ended December 31, |  | 2016 |  |  | 2015 |
Non-cash transactions: |  |  |  |
Addition of plant and equipment by means of capital leases |  | $ | 23,490 |  |  | $ | 20,058 |
Reclass from plant and equipment to assets held for sale |  | (1,374 | ) |  | (1,566 | )
Non-cash working capital exclusions: |  |  |  |
Decrease in inventory resulting from reclassification to plant and equipment |  | — |  |  | (1,128 | )
Decrease in inventory related to a non-monetary transaction |  | (575 | ) |  | — |
Net increase in accounts receivable related to sale of plant and equipment |  | — |  |  | (3,600 | )
Net decrease in accounts payable related to purchase of plant and equipment |  | — |  |  | (3,197 | )
Net decrease in accounts payable related to change in the lease inducement payable on the sublease |  | — |  |  | (107 | )
Increase in accrued liabilities related to the current portion of the deferred gain on sale leaseback |  | 365 |  |  | 128 |
Net decrease in accrued liabilities related to current portion of RSU liability |  | (671 | ) |  | (338 | )
Net decrease in accrued liabilities related to current portion of DSU liability |  | — |  |  | (408 | )
Net (decrease) increase in accrued liabilities related to the current portion of the senior executive stock options |  | — |  |  | (22 | )
Net increase (decrease) in accrued liabilities related to dividend payable |  | 569 |  |  | (697 | )
b) Net change in non-cash working capital The table below represents the cash (used in) provided by non-cash working capital:
Year ended December 31, |  | 2016 |  |  | 2015 |
Operating activities: |  |  |  |
Accounts receivable |  | $ | (15,344 | ) |  | $ | 45,367 |
Unbilled revenue |  | 1,600 |  |  | 26,057 |
Inventories |  | (1,437 | ) |  | 3,746 |
Prepaid expenses and deposits |  | 126 |  |  | 690 |
Accounts payable |  | 4,517 |  |  | (29,751 | )
Accrued liabilities |  | 4,144 |  |  | (6,892 | )
Billings in excess of costs incurred and estimated earnings on uncompleted contracts |  | 614 |  |  | 457 |
|  | $ | (5,780 | ) |  | $ | 39,674 |

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