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Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share - 10Q (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Summary of Significant Accounting Policies        
Net loss $ (7,950,101) $ (7,854,693) $ (24,023,210) $ (23,481,241)
Earnings Per Share, Basic and Diluted $ (0.24) $ (0.34) $ (0.86) $ (1.14)
Basic and diluted weighted average common shares outstanding 32,724,010 23,049,347 27,814,781 20,638,129