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Stock Warrants (Tables)
9 Months Ended
Sep. 30, 2015
Changes in Warrants
A summary of the various changes in warrants during the nine month period ended September 30, 2015 is as follows.
 
 
 
Number of
 
 
 
Shares
 
 
 
 
 
 
Warrants Outstanding at December 31, 2014
 
 
5,236,660
 
Exercised During the Period
 
 
(4,721,517)
 
Issued During the Period
 
 
60,000
 
Expired During the Period
 
 
(14,814)
 
 
 
 
 
 
Warrants Outstanding, September 30, 2015
 
 
560,329
 
Summary of assumptions used to compute the fair value of stock options granted
The following summary table shows the assumptions used to compute the fair value of warrants granted during the nine month period ended September 30, 2015 for investor relations services and their estimated value:
 
·
Expected term in years
 
2.8 to 3.0 years
·
Volatility
 
122.8 to 122.9%
·
Risk-free interest rate
 
0.90 to 0.99%
·
Expected annual dividends
 
None
·
Fair value of warrants issued
 
$260,373