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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2013
Stockholders' Equity  
Schedule of redemption prices per share

 

Year from November 1, 2012 to October 31, 2013   $ 10.12  
Year from November 1, 2013 to October 31, 2014   $ 10.06  
November 1, 2014 and thereafter   $ 10.00  
 
Schedule of conversion of convertible preferred stock

 

  Year ended
December 31,
2013
 
Preferred shares exchanged     877,869  
Common shares issued:        
At stated convertible option     53,366  
Incremental shares issued under the exchange transaction     1,631,105  
Total common shares issued     1,684,471  
 
Schedule of warrants outstanding
Issued in Connection With   Expiration
Date
    Common
Shares
Issuable
    Weighted
Average
Exercise
Price
 
February 2007 stock issuance   2014       151,773     $ 59.08  
July 2009 Series II stock issuance   2014       98,893     $ 7.00  
January 2010 stock issuance   2015       101,785     $ 22.82  
January 2010 stock issuance   2015       100,714     $ 19.95  
October 2010 stock issuance   2015       594,513     $ 13.44  
July 2011 stock issuance   2016       544,117     $ 9.52  
Total           1,591,795     $ 17.06