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Restructuring and Related Charges - Summary of Activity Related to Restructuring (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Provision			$ 294
GridSense [Member]
Beginning balance	$ 63	$ 38	63
Provision	$ 198		198
Cash payments			(223)
Adjustment		$ (4)
Ending balance		$ 34	$ 38	$ 63
GridSense [Member] | Other [Member]
Beginning balance
Provision			$ 72
Cash payments			$ (72)
Adjustment
Ending balance
GridSense [Member] | Facilities [Member]
Beginning balance
Provision			$ 7
Cash payments			$ (7)
Adjustment
Ending balance
GridSense [Member] | Employee Severance And Termination Benefits [Member]
Beginning balance	$ 63	$ 38	$ 63
Provision			119
Cash payments			$ (144)
Adjustment		$ (4)
Ending balance		$ 34	$ 38	$ 63
OmniMetrix technologies [Member] | Inventory And Fixed Asset Impairements [Member]
Beginning balance
Provision
Cash payments
Adjustment
Ending balance
OmniMetrix technologies [Member] | Facilities [Member]
Beginning balance	$ 194	$ 248	$ 194
Provision			96
Cash payments		$ (44)	(42)
Adjustment
Ending balance		$ 204	248	$ 194
OmniMetrix technologies [Member] | Employee Severance And Termination Benefits [Member]
Beginning balance	45		$ 45
Provision
Cash payments			$ (45)
Adjustment
Ending balance				45
Omni Metrix [Member]
Beginning balance	$ 239	$ 248	$ 239
Provision			96
Cash payments		$ (44)	(87)	194
Adjustment
Ending balance		$ 204	$ 248	$ 239

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
-Subparagraph (b)
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-Section 50
-Paragraph 1
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 420
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-Name Accounting Standards Codification
-Topic 420
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
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Amount of (expense) reversal of expense related to a previously accrued restructuring cost liability. Excludes adjustments for costs incurred, costs settled, and foreign currency translation adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 40
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6394291&loc=d3e17658-110867

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