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Stock Option Plans (Tables)
9 Months Ended
Sep. 30, 2015
Stock option plans
A summary of stock option activity for the nine months ended September 30, 2015 is as follows:
 
 
 
 
 
 
Weighted
 
 
 
 
Number of
 
Average
 
 
 
Shares
 
Exercise Price
 
 
 
 
 
 
Outstanding at December 31, 2014
 
 
720,551
 
$
4.46
 
Granted
 
 
254,000
 
$
5.45
 
Exercised
 
 
(15,833)
 
$
2.60
 
Expired or Forfeited
 
 
(34,167)
 
$
3.38
 
 
 
 
 
 
 
 
 
Outstanding at September 30, 2015
 
 
924,551
 
$
4.81
 
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
Equity Option [Member]  
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 options granted during the nine month period ended September 30, 2015 and their estimated value: 
 
·
Expected term in years
 
6.0 years
·
Volatility
 
111.1% to 113.5%
·
Risk-free interest rate
 
1.74% to 1.84%
·
Expected annual dividends
 
None
·
Fair value of options issued
 
$1,159,754