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Warrants to Purchase Common Shares Outstanding (Detail)
Mar. 31, 2012
Class of Warrant or Right [Line Items]  
Amount 21,066,363
Exercise Price 1.48
Warrant issued on 4/27/07
  
Class of Warrant or Right [Line Items]  
Amount 17,500
Exercise Price 17.90
Expiration Date 2014-01-17
Warrant issued on 6/1/07
  
Class of Warrant or Right [Line Items]  
Amount 55,737
Exercise Price 7.20
Expiration Date 2012-05-31
Warrant issued on 12/5/07
  
Class of Warrant or Right [Line Items]  
Amount 516,300
Exercise Price 1.17
Expiration Date 2012-12-03
Warrant issued on 7/31/09
  
Class of Warrant or Right [Line Items]  
Amount 138,888
Exercise Price 1.00
Expiration Date 2014-07-30
Warrant issued on 7/31/09
  
Class of Warrant or Right [Line Items]  
Amount 1,666,000
Exercise Price 1.00
Expiration Date 2014-07-30
Warrant issued on 10/16/09
  
Class of Warrant or Right [Line Items]  
Amount 18,024,888
Exercise Price 1.50
Expiration Date 2014-10-15
Warrant issued on 10/16/09
  
Class of Warrant or Right [Line Items]  
Amount 647,050
Exercise Price 1.50
Expiration Date 2014-10-15