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Long-term debt - Purchase warrants issued to CIBC (Details) $ in Thousands		12 Months Ended
	Jul. 31, 2018 $ / shares shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares
Variables used to determine the fair value of warrants
Share price | $ / shares		$ 14.26	$ 26.19
Volatility		61.00%	63.00%
Expected life of warrants		1 year 7 months 6 days	2 years 7 months 6 days
Risk free interest rate		0.94%	0.20%
CIBC loan
Disclosure of detailed information about borrowings [line items]
Number of warrants issued | shares	32,171
Number of common share that each warrant entitles the holder | shares	1
Purchase warrant price per common share | $ / shares	$ 9.70
Term of the warrant	60 months
Fair value of warrants | $		$ 161	$ 450

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The expected life of warrants granted used to calculate the fair value of the warrants granted.

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The expected volatility of the share price used to calculate the fair value of the warrants granted.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The risk free interest rate used to calculate the fair value of the warrants granted.

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The weighted average share price used as input for the measurement of fair value of warrants granted.

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