Quarterly report pursuant to Section 13 or 15(d)

Organization and Basis of Presentation - Additional Information (Detail)

v3.8.0.1
Organization and Basis of Presentation - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Date of incorporation Jul. 13, 2005  
Accumulated deficit $ 163,650,462 $ 150,632,452