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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deficit    
Share capital, shares outstanding (in shares) 112,342,989us-gaap_CommonStockSharesOutstanding 86,511,713us-gaap_CommonStockSharesOutstanding
Ordinary shares issued (dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare