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Income (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 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator:                
Net income (loss) from continuing operations $ (1,434)     $ (14,631)     $ (6,158) $ (47,379)
Net income (loss) from discontinued operations (1,944)     (14,334)     (3,237) 81,674
Net income (loss) $ (3,378) $ (2,414) $ (3,603) $ (28,965) $ 112,281 $ (49,021) $ (9,395) $ 34,295
Denominator:                
Weighted average common shares for basic loss per common share 10,701     9,261     10,241 8,877
Effect of dilutive securities 0     0     0 0
Weighted average common shares for diluted loss per common share 10,701     9,261     10,241 8,877
Income (loss) per common share, basic:                
Basic $ (0.13)     $ (1.58)     $ (0.6) $ (5.34)
Diluted (0.13)     (1.58)     (0.6) (5.34)
Income (loss) per common share, diluted:                
Basic (0.18)     (1.55)     (0.32) 9.2
Diluted $ (0.18)     $ (1.55)     $ (0.32) $ 9.2