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Financial instruments and risk management - Trade receivables (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Not past due | $ 60,326,000 | $ 42,882,000
Past due 1-30 days | 6,649,000 | 2,566,000
Past due 31-60 days | 728,000 | 0
More than 61 days | 768,000 | 268,000
Total | 68,471,000 | 45,716,000
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |
Allowance for doubtful accounts | $ 0 | $ 0
Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment terms | 15 days |
Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment terms | 60 days |

X
- Definition Accounts Receivable, 1 to 30 Days Past Due + References No definition available. + Details
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- Definition Accounts Receivable, 31 to 60 Days Past Due + References No definition available. + Details
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- Definition Accounts Receivable, General Payment Terms + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount 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, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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