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Capital Stock
 3 Months Ended
Mar. 31, 2016
Equity [Abstract]  
Capital Stock
Capital Stock
Exercise of options
For the three months ended March 31, 2016 and 2015, 4,466 and 64,263 shares were exercised at a weighted-average exercise price of $1.61 and $1.93 per share, respectively, with net cash proceeds of $7 thousand and $124 thousand, respectively.
Warrants
Our outstanding warrants are exercisable for common stock at any time during their respective terms. As of March 31, 2016, the following warrants remain outstanding:
 
March 31, 2016
Issue Date
Shares Subject
to Warrants
 
Exercise Price
per Share
 
Expiration
September 28, 2007
72,727
 
$
8.25

 
September 28, 2017