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Basis of Presentation and Revenue Recognition (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 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) 22.40% 4.20% 22.90% 6.10%