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Financial instruments and risk management (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

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, 2019						December 31, 2018
		Fair Value Hierarchy Level		Carrying Amount			Fair Value			Carrying Amount			Fair Value
Convertible debentures		Level 1		94,031			112,970			39,976			48,371
Finance lease obligations		Level 2		76,278			69,929			86,568			78,373
Promissory notes		Level 2		14,648			14,399			42,937			42,937

Schedule of major customers

At December 31, 2019 and December 31, 2018, the following customers represented 10% or more of accounts receivable and contract assets:

		December 31, 2019			December 31, 2018
Customer 1		36	%		16	%
Customer 2		25	%		8	%
Customer 3		13	%		33	%
Customer 4		12	%		12	%

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

Year ended December 31,		2019			2018
Customer A		33	%		43	%
Customer B		27	%		2	%
Customer C		22	%		23	%
Customer D		13	%		21	%

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

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

		December 31, 2019				December 31, 2018
Trade accounts receivable		$	38,686			$	67,913
Holdbacks		7,152				558
Accrued trade receivables		13,174				9,807
Contract receivables, included in accounts receivable		$	59,012			$	78,278
Other receivables		7,734				4,121
Total accounts receivable		$	66,746			$	82,399
Contract assets		19,193				10,673
Total		$	85,939			$	93,072

Schedule of trade receivables aging

As at December 31, 2019 and December 31, 2018, trade receivables and holdbacks are aged as follows:

		December 31, 2019				December 31, 2018
Not past due		$	35,409			$	60,326
Past due 1-30 days		10,380				6,649
Past due 31-60 days		5				728
More than 61 days		44				768
Total		$	45,838			$	68,471

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Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

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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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Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

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