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Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Summary of Significant Accounting Policies    
Net loss $ (11,512,844) $ (7,931,313)
Earnings Per Share, Basic and Diluted $ (0.33) $ (0.34)
Basic and diluted weighted average common shares outstanding 35,156,090 23,480,432