Warrants - Outstanding Warrants To Purchase Common Stock Warrants (Parenthetical) (Detail) - Common Stock [Member]	6 Months Ended
	Jun. 30, 2016
Private Placement [Member] | Accredited Investors [Member]
Class Of Warrant Or Right [Line Items]
Warrants, issued date	Apr. 14, 2016
Private Placement [Member] | Placement Agents [Member]
Class Of Warrant Or Right [Line Items]
Warrants, issued date	Apr. 14, 2016
Subsequent Financing [Member]
Class Of Warrant Or Right [Line Items]
Warrants, issued date	Jun. 15, 2016