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Basic and diluted net earnings (loss) per share - Additional Information (Detail) - shares	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Options and Convertible Debentures
Class of Stock [Line Items]
Anti-dilutive convertible debentures (in shares)	6,350,530	1,134,711

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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