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Outstanding warrants to purchase common stock (Details)
Dec. 31, 2013
Dec. 31, 2012
Number of Shares of warrants 1,033,776 607,776
Common stock financing
   
Number of Shares of warrants 57,776 57,776
Price Per Share 1.8 1.8
Issue Date 2009-05 2009-05
Expiration Date 2014-05 2014-05
Senior convertible note financing
   
Number of Shares of warrants 976,000 550,000
Price Per Share 1.25 2.44
Issue Date 2010-11 2010-11
Expiration Date 2016-05 2016-05