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Capital Stock
 9 Months Ended
Sep. 30, 2015
Equity [Abstract]  
Capital Stock
Capital Stock
Exercise of options
For the nine months ended September 30, 2015 and 2014, 128,921 and 136,796 shares were exercised at a weighted-average exercise price of $1.82 and $1.34 per share, respectively, with net cash proceeds of $0.2 million for both periods.
Warrants
Our outstanding warrants are exercisable for common stock at any time during their respective terms. As of September 30, 2015, the following warrants remain outstanding:
September 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