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Capital Structure - Summary of changes in series 1 convertible preferred stock and common stock shares (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2007
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Series 1 Convertible Preferred Stock
        
Balance, beginning (in shares)   376,387 376,387 376,387
Preferred stock conversions (in shares) 2,000,000       
Common stock issuances (in shares)          
Balance, ending (in shares)   376,387 376,387 376,387
Common Stock
        
Balance, beginning (in shares)   18,634,369 18,634,369 18,634,369
Preferred stock conversions (in shares)          
Common stock issuances (in shares)   2,514,493     
Balance, ending (in shares)   21,148,862 18,634,369 18,634,369