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Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Summary of Significant Accounting Policies        
Net loss $ (11,278,763) $ (8,141,796) $ (22,791,607) $ (16,073,109)
Earnings Per Share, Basic and Diluted $ (0.26) $ (0.30) $ (0.58) $ (0.63)
Basic and diluted weighted average common shares outstanding 42,809,840 27,239,902 38,982,965 25,360,167