Warrant Liability - Summary of Warrant Liability (Detail) (USD $)	Jun. 30, 2014
Class of Warrant or Right [Line Items]
Number Outstanding	7,666,895
Outstanding Warrants [Member]
Class of Warrant or Right [Line Items]
Fair Value	$ 8,525,666
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Number Outstanding	7,266,895
Exercise Price per share	1.40
Series A Warrants [Member] | Outstanding Warrants [Member]
Class of Warrant or Right [Line Items]
Fair Value	8,525,666
November 2009 Financing [Member]
Class of Warrant or Right [Line Items]
Number Outstanding	400,000
Exercise Price per share	15.00
November 2009 Financing [Member] | Outstanding Warrants [Member]
Class of Warrant or Right [Line Items]
Fair Value