XML 61 R51.htm IDEA: XBRL DOCUMENT

Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Class of Warrant or Right [Line Items]
Number of Warrants, ending balance	7,666,895	7,666,895
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Warrants, beginning balance	8,116,895
Number of Warrants, Less exercised	(850,000)	(850,000)
Number of Warrants, changes in fair value
Number of Warrants, ending balance	7,266,895	7,266,895
Fair value of warrant liability, beginning balance	$ 5,868,433
Fair value of warrants exercised	(997,237)
Fair value, changes in fair value at period end	3,654,470
Fair value of warrant liability, ending balance	$ 8,525,666	$ 8,525,666