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Discontinued Operations - Schedule of Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenues $ 4,807 $ 4,723 $ 9,425 $ 9,177
Gross profit 1,665 1,276 3,184 2,706
Net loss (3,176) (5,921) (6,110) (10,496)
Net loss attributable to Acorn Energy Inc. (3,149) $ (5,527) (5,918) $ (9,831)
USSI's [Member] | Discontinued Operations [Member]        
Revenues 79   79  
Gross profit 4 $ (242) (86) $ (430)
Net loss (229) (2,238) (1,381) (4,194)
Net loss attributable to non-controlling interests 31 281 175 527
Net loss attributable to Acorn Energy Inc. $ (198) $ (1,957) $ (1,206) $ (3,667)