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Financial instruments and risk management - Maximum credit exposure (Details) - CAD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Trade accounts receivable	$ 23,692	$ 38,686
Holdbacks	64	7,152
Accrued trade receivables	8,445	13,174
Contract receivables, included in accounts receivable	32,201	59,012
Other receivables	4,172	7,734
Total accounts receivable	36,373	66,746
Contract assets	7,034	19,193	$ 10,673
Total	$ 43,407	$ 85,939

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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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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