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Accrued Wind-Down Expenses - Summary of Accrued Wind-Down Expenses (Detail)
Jun. 30, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]  
Total accrued wind-down expense $ 3,943,310
Employee Related [Member]  
Restructuring Cost and Reserve [Line Items]  
Total accrued wind-down expense 2,562,648
External Services [Member]  
Restructuring Cost and Reserve [Line Items]  
Total accrued wind-down expense 99,170
Legal [Member]  
Restructuring Cost and Reserve [Line Items]  
Total accrued wind-down expense 5,000
Facilities Related [Member]  
Restructuring Cost and Reserve [Line Items]  
Total accrued wind-down expense 1,118,186
Clinical Trials Closeout [Member]  
Restructuring Cost and Reserve [Line Items]  
Total accrued wind-down expense 4,675
Other [Member]  
Restructuring Cost and Reserve [Line Items]  
Total accrued wind-down expense $ 153,631