Derivative Financial Instruments - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Apr. 13, 2014	Oct. 11, 2013	May 10, 2012	Nov. 08, 2011	Apr. 08, 2011	Oct. 11, 2010
Derivative [Line Items]
Warrants issued to acquire common shares					260,417	108,507		150,000
Warrants exercisable date	Apr. 13, 2014
Warrants linked to common stock, outstanding	0	0
Shares available for issuance upon exercise					36,169	36,169
Face amount of new loans					$ 8,000,000
Warrants Attached to Series G Preferred Stock [Member]
Derivative [Line Items]
Warrants issued to acquire common shares							43,750
Warrants Attached to Senior Convertible Debt [Member]
Derivative [Line Items]
Warrants issued to acquire common shares						108,507
Warrants linked to common stock, outstanding	130,208
Common Stock [Member]
Derivative [Line Items]
Linked common shares			525,000
Common Stock [Member] | Level 3 [Member]
Derivative [Line Items]
Linked common shares				1,725,000
Warrants exercisable date	Oct. 11, 2013