Financial Instruments - Summary of Analysis of Age of Trade Receivables (Detail) - Credit risk [member] - CAD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Disclosure of detailed information about financial instruments [line items] | ||
| Analysis of the age of trade receivables | $ 1,140 | $ 107 |
| Less than 30 days past billing date [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Analysis of the age of trade receivables | 1,020 | 63 |
| 31 to 60 days past billing date [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Analysis of the age of trade receivables | 85 | 16 |
| 61 to 90 days past billing date [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Analysis of the age of trade receivables | $ 35 | 9 |
| Over 90 days past billing date [member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Analysis of the age of trade receivables | $ 19 |