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Warrants to Purchase Common Shares Outstanding (Detail)
 6 Months Ended
Jun. 30, 2014
Class of Warrant or Right [Line Items]  
Amount 9,772,276
Exercise Price 1.41
Warrant issued on 7/31/09
  
Class of Warrant or Right [Line Items]  
Amount 1,684,888
Exercise Price 1.00
Expiration Date 7/30/14
Warrant issued on 10/16/09
  
Class of Warrant or Right [Line Items]  
Amount 7,487,388
Exercise Price 1.50
Expiration Date 10/15/14
Warrant issued on 10/16/09
  
Class of Warrant or Right [Line Items]  
Amount 600,000
Exercise Price 1.50
Expiration Date 10/15/14