Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share of Common Stock - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share for Common Stockholders (Detail)

v3.19.3
Net Loss Per Share of Common Stock - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share for Common Stockholders (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]                
Net loss $ (5,359,118) $ (8,666,906) $ 11,587,015 $ (4,377,747) $ (20,135,892) $ (19,106,481) $ (2,439,009) $ (43,620,120)
Weighted average shares of common stock outstanding 79,409,556     77,447,599     79,409,556 74,934,774
Net loss per share of common stock-basic and diluted $ (0.07)     $ (0.06)     $ (0.03) $ (0.58)