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Condensed Statement of Changes in Shareholders' Deficit (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Condensed Statement of Changes in Shareholders' Deficit [Abstract]          
Shareholders’ deficit - opening balance     $ (23,047,309) [1]    
Net loss for the period 37,075,604 30,814,492 (2,288,907) 82,726,949  
Adjustment of redeemable Shares to redemption value     11,178,924   157,606,787
Shareholders’ deficit – closing balance $ (14,157,292)   $ (14,157,292)   $ (23,047,309) [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.