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Condensed Statement of Changes in Shareholders' Deficit (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Shareholders’ deficit - opening balance     $ (23,047,309) [1]    
Net loss for the period (38,732,769) 15,163,894 (39,364,511) 51,912,457  
Adjustment of redeemable Shares to redemption value     62,411,820   157,606,787
Shareholders’ deficit – closing balance $ 0   $ 0   $ (23,047,309) [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.