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Statement of Changes in Shareholders' Deficit (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Statement of Changes in Shareholders' Deficit [Abstract]          
Shareholders’ deficit - opening balance     $ (16,919) [1]    
Net loss for the period 18,463 3,251 (33,497) 746  
Adjustment of redeembable Shares to redemption value     49,311   (9,201)
Shareholders’ deficit - closing balance $ (1,105)   $ (1,105)   $ (16,919) [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2012.