Fair Value Measurements - Summary of Issuances, Changes in Fair Value and Reclassifications of Level 3 Financial Instruments (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	$ 948	$ 1,074
Warrants issued in conjunction with Private Placement and Subsequent Financing and Placement Agent Warrants on April 14, 2016 and June 15, 2016, respectively	4,957
Change in estimated fair value	2,855	(126)
Ending Balance	8,760	948
Significant Unobservable Inputs (Level 3), Contingent Consideration Liability [Member]
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	948	1,074
Warrants issued in conjunction with Private Placement and Subsequent Financing and Placement Agent Warrants on April 14, 2016 and June 15, 2016, respectively	0
Change in estimated fair value	(310)	(126)
Ending Balance	638	948
Significant Unobservable Inputs (Level 3), Warrants To Purchase Common Stock [Member]
Significant Unobservable Inputs (Level 3) [Line Items]
Beginning Balance	0	0
Warrants issued in conjunction with Private Placement and Subsequent Financing and Placement Agent Warrants on April 14, 2016 and June 15, 2016, respectively	4,957
Change in estimated fair value	3,165	0
Ending Balance	$ 8,122	$ 0