Warrants - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 15, 2016	Apr. 14, 2016	Dec. 31, 2015
Class Of Warrant Or Right [Line Items]
Estimated fair value of warrants					$ 1,700
Warrants issued					1,002,507
Common stock warrant liability	$ 8,122		$ 8,122				$ 0
Revaluation of common stock warrant liability to estimated fair value	$ 3,165	$ 0	$ 3,165	$ 0
Private Placement [Member]
Class Of Warrant Or Right [Line Items]
Estimated fair value of warrants						$ 3,300
Warrants issued						1,975,580
Private Placement [Member] | Accredited Investors [Member]
Class Of Warrant Or Right [Line Items]
Estimated fair value of warrants						$ 3,000
Warrants issued						1,775,580
Private Placement [Member] | Placement Agents [Member]
Class Of Warrant Or Right [Line Items]
Estimated fair value of warrants						$ 300
Warrants issued						200,000
Private Placement and Subsequent Financing [Member]
Class Of Warrant Or Right [Line Items]
Common stock warrant liability						$ 4,900