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Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended 197 Months Ended
Dec. 31, 2012
segment
area
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
area
Segments        
Number of operating segments 1      
Number of geographic areas for development operations 2     2
Property, plant and equipment        
Fixed assets sold   $ 6,000 $ 28,000  
Proceeds from sale of property, plant and equipment $ 62,000 $ 5,000 $ 41,000 $ 225,000
Property, plant and equipment | Minimum
       
Property, plant and equipment        
Estimated useful life 3 years      
Property, plant and equipment | Maximum
       
Property, plant and equipment        
Estimated useful life 5 years      
Leasehold improvements | Minimum
       
Property, plant and equipment        
Estimated useful life 5 years      
Leasehold improvements | Maximum
       
Property, plant and equipment        
Estimated useful life 15 years