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Warrants (Tables)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Warrants and Rights Note Disclosure [Abstract]    
Outstanding warrants to purchase common stock

The Company has the following outstanding warrants to purchase common stock at December 31, 2015:

 

Reason  Number
of Shares		  Price Per
Share		  Issue Date  Expiration
Date
Common stock financing    35,775   $1.80   May 2009  June 2016
Senior convertible note financing    133,560   $1.25   Nov 2010  May 2016
    169,335            

The Company has the following outstanding warrants to purchase common stock at December 31, 2014:

 

Reason  Number
of Shares		  Price Per
Share		  Issue Date  Expiration
Date
Common stock financing    35,775   $1.80   May 2009  June 2016
Senior convertible note financing
(fully converted in 2011) (a) 		   277,600   $1.25   Nov 2010  May 2016
    313,375