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Long-term debt - Purchase warrants issued to CIBC (Details) - CIBC loan $ in Thousands				12 Months Ended
	Jun. 14, 2023 USD ($) $ / shares shares	Nov. 03, 2022 $ / shares shares	Jul. 30, 2018 $ / shares shares	Dec. 31, 2022 USD ($) $ / shares
November 3, 2022
Long-term debt
Number of warrants issued		47,287
Number of common share that each warrant entitles the holder		1
Purchase warrant price per common share | $ / shares		$ 5.29
Term of the warrant		10 years
Exercise of warrants (shares)	34,537
Fair value of warrants | $	$ 568			$ 418
Variables used to determine the fair value of warrants
Share price | $ / shares	$ 19.16			$ 14.48
Volatility	70.00%			70.00%
Expected life of warrants	6 years 4 months 24 days			6 years 10 months 24 days
Risk free interest rate	3.52%			3.30%
July 30, 2018
Long-term debt
Number of warrants issued			32,171
Number of common share that each warrant entitles the holder			1
Purchase warrant price per common share | $ / shares			$ 9.70
Term of the warrant			60 months
Exercise of warrants (shares)	16,266
Fair value of warrants | $	$ 227			$ 145
Variables used to determine the fair value of warrants
Share price | $ / shares	$ 19.60			$ 14.48
Volatility	80.00%			84.00%
Expected life of warrants	1 month 6 days			7 months 6 days
Risk free interest rate	4.52%			4.07%

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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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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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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 increase (decrease) in number of shares resulting from exercise of warrants.

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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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