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Accrued Wind-Down Expenses - Summary of Wind-Down Expenses (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]    
Total wind-down expense $ 3,803,448 $ 3,803,448
Employee Related [Member]    
Restructuring Cost and Reserve [Line Items]    
Total wind-down expense 3,343,684  
External Services [Member]    
Restructuring Cost and Reserve [Line Items]    
Total wind-down expense 318,953  
Legal [Member]    
Restructuring Cost and Reserve [Line Items]    
Total wind-down expense 83,206  
Facilities Related [Member]    
Restructuring Cost and Reserve [Line Items]    
Total wind-down expense (593,731)  
Clinical Trials Closeout [Member]    
Restructuring Cost and Reserve [Line Items]    
Total wind-down expense 430,713  
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Total wind-down expense $ 220,624