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Warrant Liability - Summary of Changes in Fair Value of Warrant Liability (Detail) (USD $)
 3 Months Ended
Sep. 30, 2014
Class of Warrant or Right [Line Items]  
Number of Warrants, ending balance 7,336,880
Series A Warrants [Member]
  
Class of Warrant or Right [Line Items]  
Number of Warrants, beginning balance 7,266,895
Number of Warrants, Less exercised (330,015)
Number of Warrants, changes in fair value   
Number of Warrants, ending balance 6,936,880
Fair value of warrant liability, beginning balance $ 8,525,666
Fair value of warrants exercised (437,570)
Fair value, changes in fair value at period end (4,076,360)
Fair value of warrant liability, ending balance $ 4,011,736