Basis of Presentation and Revenue Recognition (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 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 customer 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)	21.00%	0.00%