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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net income (loss) attributable to Acorn Energy, Inc. shareholders $ (1,169) $ 145
Other comprehensive income:    
Foreign currency translation adjustments 6
Comprehensive income (loss) (1,169) 151
Other comprehensive income attributable to non-controlling interests 2
Comprehensive income (loss) attributable to Acorn Energy, Inc. shareholders $ (1,169) $ 153