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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Schedule of common stock warrants issued and outstanding
At December 31, 2014, the following warrants were issued and outstanding: 
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