Basis of Presentation and Revenue Recognition (Details) - Segment	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basis of Presentation and Revenue Recognition [Abstract]
Number of reportable segment			2
Term of warranty (in years)			1 year
Period of post customer support service (PCS) (in years)			1 year
Revenue [Member]
Revenue by major customers [Abstract]
Concentration Risk, Benchmark Description			the following customers provided more than 10% of the Company’s consolidated revenue
Revenue [Member] | Tennessee Valley Authority [Member]
Revenue by major customers [Abstract]
Percentage of revenue contributed by major customers (in hundredths)	18.70%	0.00%	19.90%	0.00%
Revenue [Member] | Public Service Enterprise Group Inc. [Member]
Revenue by major customers [Abstract]
Percentage of revenue contributed by major customers (in hundredths)	11.70%	0.60%	10.20%	0.60%