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Financial instruments and risk management (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of financial instruments with carrying amounts that differ from fair values

Financial instruments with carrying amounts that differ from their fair values are as follows:



		December 31, 2018				December 31, 2017
	Fair Value Hierarchy Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Capital lease obligations	Level 2	$	86,568	$	78,373	$	66,969	$	61,872
Convertible Debentures	Level 2	39,976		48,371		40,000		38,700
Credit facilities	Level 3	194,918		194,918		32,000		32,000
Mortgage	Level 2	19,900		19,900		—		—
Promissory notes	Level 2	42,937		42,937		—		—

Schedule of non-financial assets measured at fair value on a non-recurring basis

Non-financial assets measured at estimated fair market value on a non-recurring basis as at December 31, 2018 and 2017 in the financial statements are summarized below:



	December 31, 2018					December 31, 2017
	Change in Fair Value			Carrying Amount		Change in Fair Value			Carrying Amount
Assets held for sale	$	(1,278	)	$	672	$	(72	)	$	5,642

Schedule of major customers

At December 31, 2018 and December 31, 2017, the following customers represented 10% or more of accounts receivable and contract assets:



	December 31, 2018		December 31, 2017
Customer 1	33	%	42	%
Customer 2	16	%	20	%
Customer 3	12	%	10	%
Customer 4	7	%	10	%
Customer 5	4	%	12	%

The following customers accounted for 10% or more of total revenues:



Year ended December 31,	2018		2017
Customer A	43	%	44	%
Customer B	23	%	26	%
Customer C	21	%	17	%
Customer D	9	%	11	%

Schedule of maximum exposure to credit risk for accounts receivable and unbilled revenue

The Company’s maximum exposure to credit risk for accounts receivable and contract assets is as follows:



	December 31, 2018		December 31, 2017
Trade accounts receivable	$	67,913	$	45,158
Holdbacks	558		558
Accrued trade receivables	9,807		—
Other receivables	4,121		1,090
Total accounts receivable	$	82,399	$	46,806
Contract assets	10,673		21,572
Total	$	93,072	$	68,378

Schedule of trade receivables aging

As at December 31, 2018 and December 31, 2017, trade receivables and holdbacks are aged as follows:



	December 31, 2018		December 31, 2017
Not past due	$	60,326	$	42,882
Past due 1-30 days	6,649		2,566
Past due 31-60 days	728		—
More than 61 days	768		268
Total	$	68,471	$	45,716

- Definition

Tabular disclosure of all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. The disclosure concerning concentrations of risk may consist of the following information: (1) for concentrations of credit risk disclosure may include: (a) information about the (shared) activity, region, or economic characteristic that identifies the concentration, (b) the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity, (c) the policy of requiring collateral or other security to support financial instruments subject to credit risk, information about the entity's access to that collateral or other security, and the nature and a brief description of the collateral or other security supporting those financial instruments, and (d) the policy of entering into master netting arrangements to mitigate the credit risk of financial instruments, information about the arrangements for which the entity is a party, and a brief description of the terms of those arrangements, including the extent to which they would reduce the entity's maximum amount of loss due to credit risk and (2) for disclosure of quantitative information about the market risks of financial instruments that is consistent with the way the company manages or adjusts those risks, disclosure may include: (a) more details about current positions and perhaps activity during the period, (b) the hypothetical effects on comprehensive income (or net assets), or annual income, of several possible changes in market prices, (c) a gap analysis of interest rate re-pricing or maturity dates, (d) the duration of the financial instruments, (e) the entity's value at risk from derivatives and from other positions at the end of the reporting period and the average value at risk during the year, or (f) other ways of reporting quantitative information as internally developed.

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