Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Net Loss Per Share of Common Stock - Schedule of Computation of Basic and Diluted Loss Per Share for Common Stockholders (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]                      
Net loss applicable to common stockholders $ (10,355,484) $ (5,359,118) $ (8,666,906) $ 11,587,015 $ 5,935,696 $ (4,377,747) $ (20,135,892) $ (19,106,481) $ (12,794,493) $ (37,684,424) $ (15,517,658)
Weighted average shares of common stock outstanding                 8,283,509 7,606,266 5,559,573
Net loss per share of common stock—basic and diluted $ (1.11) $ (0.67) $ (1.09) $ 1.46 $ 0.75 $ (0.57) $ (2.73) $ (2.59) $ (1.54) $ (4.95) $ (2.79)