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Restructuring and Related Charges - Summary of Restructing Charges (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Total   $ 294
GridSense [Member]      
Employee severance and termination benefits   119
Other   79
Total $ 198 $ 198