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Financing (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Debt Conversion [Line Items]  
Debentures, Outstanding principal and accrued interest $ 42,599
Debentures, Principal and accrued interest converted since inception $ 11,720
Common shares issued (in shares) 4,328,415