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Inventory (Details Narrative) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Inventory impairment charge $ 146 $ 101
Inventory valuation reserves 360 319
M2M Segment [Member]    
Inventory impairment charge 22 88
PM [Member]    
Inventory impairment charge   $ 13
GridSense Segment [Member]    
Inventory impairment charge $ 124