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Warrants to Purchase Common Shares Outstanding (Detail)
Mar. 31, 2013
Class of Warrant or Right [Line Items]  
Amount 9,866,826
Exercise Price 1.44
Warrant issued on 4/27/07
  
Class of Warrant or Right [Line Items]  
Amount 17,500
Exercise Price 17.90
Expiration Date 1/17/14
Warrant issued on 7/31/09
  
Class of Warrant or Right [Line Items]  
Amount 1,734,888
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 627,050
Exercise Price 1.50
Expiration Date 10/15/14