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Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Summary of Significant Accounting Policies        
Net loss $ (11,575,111) $ (7,950,101) $ (34,366,718) $ (24,023,210)
Earnings Per Share, Basic and Diluted $ (0.27) $ (0.24) $ (0.85) $ (0.86)
Basic and diluted weighted average common shares outstanding 43,069,282 32,724,010 40,345,071 27,814,781