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Basis of Presentation and Revenue Recognition (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Basis of Presentation and Revenue Recognition [Abstract]        
Number of reportable segment     1  
Minimum term of contract (in years)     1 year  
Maximum term of contract (in years)     3 years  
Term of warranty (in years)     1 year  
Period of post customer support service (PCS) (in years)     1 year  
Benchmark to disclose customers of consolidated revenue, minimum percentage (in hundredths)     10.00%  
Revenue [Member] | Slovenske elektrarne, a.s. [Member]
       
Revenue by major customers [Abstract]        
Percentage of revenue contributed by major customers (in hundredths) 31.10% 2.30% 25.60% 4.80%
Revenue [Member] | BP Products North America [Member]
       
Revenue by major customers [Abstract]        
Percentage of revenue contributed by major customers (in hundredths) 0.50% 15.60% 0.60% 6.20%