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Going Concern - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Net loss $ (3,173,538) $ (4,578,781)  
Cash used to fund operations (3,558,701) $ (3,343,177)  
Accumulated deficit $ (80,858,377)   $ (77,684,839)