Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Net Loss Per Share of Common Stock - Schedule of Computation of Basic and Diluted Net Loss Per Share for Common Stockholders (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Net loss applicable to common stockholders $ (9,679,022) $ (7,116,340) $ (18,602,184) $ (11,968,103)
Weighted average shares of common stock outstanding 27,497,424 21,244,276 27,490,667 20,735,695
Net loss per share of common stock-basic and diluted $ (0.35) $ (0.33) $ (0.68) $ (0.58)