Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Schedule of Share-Based Compensation Expense is Classified in Condensed Consolidated Statements of Comprehensive Loss (Detail)

v2.4.0.8
Share-Based Compensation - Schedule of Share-Based Compensation Expense is Classified in Condensed Consolidated Statements of Comprehensive Loss (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation $ 246,258 $ 123,374 $ 678,508 $ 336,275
Research and Development Expenses [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation 155,893 14,959 189,986 52,527
Administrative Expenses [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation $ 90,365 $ 108,415 $ 488,522 $ 283,748