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Stockholders' Equity (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 197 Months Ended 12 Months Ended 185 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Preferred stock
Dec. 31, 2011
Preferred stock
Dec. 31, 2010
Common stock
Stockholders' Equity            
Number of shares of Preferred Stock exchanged for common stock   0 0      
Conversion of Convertible Preferred Stock            
Preferred shares exchanged (in shares)       833,671 1,776,858  
Common shares issued:            
At stated convertible option (in shares)           50,679
Incremental shares issued under the exchange transaction (in shares)           185,835
Total common shares issued (in shares)           236,514
Deemed dividends recorded $ 3,515 $ 3,515