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Restructuring and Related Charges - Summary of Restructing Charges (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Total	$ 294us-gaap_RestructuringCharges	$ 1,389us-gaap_RestructuringCharges
GridSense [Member]
Employee severance and termination benefits	119	302
Facilities costs		101
Abandonment of fixed assets		39
Inventory obsolescence		152
Other	79
Total	$ 198	$ 594

- Definition

Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

+ References+ Details

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details