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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Concentration Risk [Line Items]
Securities excluded from net loss per share calculation		175		1,000
Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	82.00%	72.00%	85.00%	67.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | Countries Outside the United States [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	1.00%	1.00%	1.00%	1.00%
Energy Management Products, LLC [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	74.00%	61.00%	79.00%	51.00%
Energy Management Products, LLC [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			71.00%		55.00%
DFAS Columbus [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		11.00%		16.00%
DFAS Columbus [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			18.00%
ES Entegral Solutions, Inc. [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage					20.00%
Johnson Controls, Inc. [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage					11.00%

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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