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Warrants (Tables)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Other Liabilities Disclosure [Abstract]    
Outstanding warrants to purchase common stock

 

Reason

 

Number

of Shares

 

Price Per

Share

 

 

Issue Date

 

Expiration

Date

Common stock financing    57,776   $1.80   May 2009  May 2014

Senior convertible note financing

(fully converted in 2011) (a)

   976,000   $1.25   Nov 2010  May 2016
    1,033,776            

 

Reason

 

Number

of Shares

 

Price Per

Share

 

 

Issue Date

 

Expiration

Date

Common stock financing    57,776   $1.80   May 2009  May 2014

Senior convertible note financing

(fully converted in 2011) (a)

   550,000   $2.44   Nov 2010  May 2016
    607,776