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Basis of Presentation and Revenue Recognition (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Basis of Presentation and Revenue Recognition [Abstract]        
Number of reportable segment     1  
Minimum term of contract (in months)     12M  
Maximum term of contract (in years)     3Y  
Term of warranty (in years)     1Y  
Period of post customer support service (PCS) (in years)     1Y  
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) 2.30% 12.50% 4.80% 12.30%
Revenue [Member] | BP Products North America [Member]
       
Revenue by major customers [Abstract]        
Percentage of revenue contributed by major customers (in hundredths) 15.60% 0.10% 6.20% 0.10%