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Loss per common share - Summary of computation of basic and diluted loss per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net loss	$ (49,021)	$ (39,383)
Denominator:
Weighted average common shares for basic loss per common share	8,614	6,945
Effect of dilutive securities	0	0
Weighted average common shares for diluted loss per common share	8,614	6,945
Loss per common share, basic and diluted	$ (5.69)	$ (5.67)

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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