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Significant Accounting Policies - Computation of Basic and Diluted Net Income Per Common Share (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net loss $ (7,168,071) $ (6,617,577) $ (3,887,795) $ (3,727,707)
Basic and diluted net loss per common share $ (0.38) $ (0.35) $ (0.20) $ (0.20)
Basic and diluted weighted average common shares outstanding 19,025,623 18,893,834 18,999,705 18,311,358