Loss per common share - Summary of computation of basic and diluted income (loss) per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net income (loss) from continuing operations	$ (2,310)	$ (17,875)
Net income (loss) from discontinued operations	(1,293)	(31,146)
Net income (loss)	$ (3,603)	$ (49,021)
Denominator:
Weighted average common shares for basic loss per common share	9,754	8,614
Effect of dilutive securities	0	0
Weighted average common shares for diluted loss per common share	9,754	8,614
Income (loss) per common share, basic:
Basic	$ (0.24)	$ (2.08)
Diluted	(0.24)	(2.08)
Income (loss) per common share, diluted:
Basic	(0.13)	(3.62)
Diluted	$ (0.13)	$ (3.62)