Warrant Liability - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Jul. 05, 2016
Warrant Liability [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 3.2	$ 4.6
Increase (Decrease) in Derivative Liabilities	$ 1.4
Healthcare Institutional Investors [Member]
Warrant Liability [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	2,941,176
H.C. Wainwright Co., LLC [Member]
Warrant Liability [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	250,000