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Net (Loss) Income Per Share of Common Stock (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net (Loss) Income Per Common Share                      
Net loss $ (13,906,915) $ (11,575,111) $ (11,278,763) $ (11,512,844) $ (9,257,858) $ (7,950,101) $ (8,141,796) $ (7,931,313) $ (48,273,633) $ (33,281,068) $ (31,809,838)
Basic and diluted net loss per common share (in dollars per share) $ (0.32) $ (0.27) $ (0.26) $ (0.33) $ (0.27) $ (0.24) $ (0.30) $ (0.34) $ (1.18) $ (1.13) $ (1.50)
Basic and diluted weighted average common shares outstanding                 41,044,621 29,395,756 21,256,312
Warrants [Member]                      
Anti-dilutive securities excluded                      
Anti-dilutive securities                   553,868 553,868
Stock Options and Restricted Stock Units [Member]                      
Anti-dilutive securities excluded                      
Anti-dilutive securities                 3,937,167 3,399,124 2,817,674