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Basis of Presentation and Revenue Recognition (Details)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Basis of Presentation and Revenue Recognition [Abstract]    
Number of reportable segment 1  
Minimum term of contract (in months) 12 months  
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) 23.30% 8.00%