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Warrants (Tables)
9 Months Ended
Sep. 30, 2013
Warrants and Rights Note Disclosure [Abstract]  
Schedule of common stock warrants issued and outstanding
As of September 30, 2013, the following warrants remain outstanding:
September 30, 2013
Issue Date
Shares Subject
to warrants
 
Exercise Price
per Share
 
Expiration
July 17, 2007
2,384
 
$
12.45

 
February 9, 2016
September 28, 2007
72,727
 
$
8.25

 
September 28, 2017