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Financial instruments and risk management - Maximum credit exposure (Details) - CAD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Trade accounts receivable	$ 67,913	$ 45,158
Holdbacks	558	558
Other receivables	4,121	1,090
Accrued trade receivables	9,807	0
Total accounts receivable	82,399	46,806
Contract assets	10,673	21,572
Total	$ 93,072	$ 68,378

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Accounts Receivable, Holdbacks, Gross, Current

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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