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Capital Stock (Tables)
6 Months Ended
Jun. 30, 2015
Equity [Abstract]  
Schedule of common stock warrants issued and outstanding
As of June 30, 2015, the following warrants remain outstanding:
June 30, 2015
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