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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 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:            
Net income (loss) from continuing operations $ (2,414)   $ (14,873)   $ (4,724) $ (32,748)
Net income (loss) from discontinued operations 0   127,154   (1,293) 96,008
Net loss $ (2,414) $ (3,603) $ 112,281 $ (49,021) $ (6,017) $ 63,260
Denominator:            
Weighted average common shares for basic loss per common share 10,219   8,750   9,988 8,682
Effect of dilutive securities 0   0   0 0
Weighted average common shares for diluted loss per common share 10,219   8,750   9,988 8,682
Income (loss) per common share, basic:            
Basic $ (0.24)   $ (1.7)   $ (0.47) $ (3.77)
Diluted (0.24)   (1.7)   (0.47) (3.77)
Income (loss) per common share, diluted:            
Basic 0   14.53   (0.13) 11.06
Diluted $ 0   $ 14.53   $ (0.13) $ 11.06