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Summary of Significant Accounting Policies - Net loss per share applicable to common stockholders (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Abstract]      
Net loss $ (3,298,082) $ (2,422,361) $ (3,975,837)
Weighted average common shares outstanding used in computing net loss per share: Basic and diluted 4,853,630 4,360,217 3,795,673
Net loss per share applicable to common stockholders:      
Basic and diluted $ (0.68) $ (0.56) $ (1.05)