Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended							6 Months Ended		0 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	May 10, 2012	Nov. 08, 2011	Oct. 11, 2010	Apr. 08, 2011 Warrants Attached to Series G Preferred Stock [Member]	Jun. 30, 2014 Warrants Attached to Senior Convertible Debt [Member]	Nov. 08, 2011 Warrants Attached to Senior Convertible Debt [Member]	Oct. 11, 2013 Common Stock [Member]	Jun. 30, 2014 Common Stock [Member]	Apr. 13, 2014 Common Stock [Member]	Dec. 31, 2013 Common Stock [Member]
Derivative [Line Items]
Warrants issued to acquire common shares							1,800,000	525,000		1,302,083
Warrants linked to common stock, exercised											1,725,000
Warrants linked to common stock, outstanding									1,562,500			0		0
Warrants expiration date	Oct. 11, 2013	Apr. 13, 2014							Nov. 09, 2016
Linked common shares	1,562,500	1,562,500	1,562,500	1,562,500									525,000
Shares available for issuance upon exercise					434,027	434,027
Original principal amount					$ 8,000,000
Issued warrants to acquire common shares					260,417