Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Additional Information (Detail)

v3.7.0.1
Basis of Presentation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Revenues     $ 0    
Net loss $ 1,220,866 $ 312,615 3,203,562 $ 2,375,500  
Cash used in operations     3,665,508 $ 3,539,837  
Accumulated deficit $ 97,872,834   $ 97,872,834   $ 94,669,272