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Net loss per share applicable to common stockholders (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Numerator:    
Net income (loss) $ (620,493) $ (3,298,082)
Basic and diluted 4,865,036 4,853,630
Net income (loss) per share:    
Basic and diluted $ (0.13) $ (0.68)