Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock-based Compensation Expense Recognized (Detail)

v3.7.0.1
Stock-based Compensation - Stock-based Compensation Expense Recognized (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total Stock based compensation $ 172,018 $ 205,761
Discontinued Operations [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total Stock based compensation   229
Research and Development [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total Stock based compensation 6,614 33,633
General and Administrative [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total Stock based compensation $ 165,404 $ 171,899