Equity Instruments - Warrants Issued in Conjunction with its Senior Convertible Debentures (Detail) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Number of Warrants Outstanding
Number of Warrants Outstanding, Beginning Balance	499,076
Number of Warrants, Expired	(500)
Number of Warrants Outstanding, Ending Balance	498,576	499,076
Warrants, Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 3.24
Weighted Average Exercise Price, Warrants Expired	3.13
Weighted Average Exercise Price, Outstanding Ending Balance	$ 3.24	$ 3.24
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life, Warrants Outstanding	9 months 15 days	1 year 2 months 9 days
Registered Direct Placement One [Member]
Number of Warrants Outstanding
Number of Warrants, Exercised	0
Warrants, Weighted Average Exercise Price
Weighted Average Exercise Price, Warrants Exercised	$ 0