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Loss per share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator:            
Net loss from continuing operations $ (1,322)   $ (1,803)   $ (2,864) $ (4,990)
Net loss from discontinued operations 0   (2,378)   0 (6,145)
Net loss $ (1,322) $ (1,542) $ (4,181) $ (6,954) $ (2,864) $ (11,135)
Denominator:            
Weighted average shares used in calculating net loss per share - basic 2,510   2,282   2,502 2,229
Weighted average shares used in calculating net loss per share - diluted 2,510   2,282   2,502 2,229
Net gain (loss) per share - basic and diluted            
Net loss per share from continuing operations, basic $ (0.53)   $ (0.79)   $ (1.14) $ (2.24)
Net loss per share from continuing operations, diluted (0.53)   (0.79)   (1.14) (2.24)
Net loss per share from discontinued operations Basic 0   (1.04)   0 (2.76)
Net loss per share from discontinued operations Diluted 0   (1.04)   0 (2.76)
Basic net loss per share (0.53)   (1.83)   (1.14) (5)
Diluted net loss per share $ (0.53)   $ (1.83)   $ (1.14) $ (5)