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Share-based compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Share-Based Compensation [Abstract]  
Summary of status of company's stock option plan
A summary of the activity for stock options issued under the Company's Plans for the indicated periods is presented below:
 
 
 
 
 
Weighted
 
 
 
 
 
Average
 
Stock Option Plan Totals
 
Shares
 
Exercise Price
 
Outstanding at December 31, 2015
 
 
2,633,589
 
$
2.06
 
-Exercised
 
 
(589,725)
 
$
2.43
 
-Granted
 
 
1,170,534
 
$
3.95
 
Outstanding at December 31, 2016
 
 
3,214,398
 
$
2.68
 
-Exercised
 
 
(984,861)
 
$
3.07
 
Outstanding at September 30, 2017, (unaudited)
 
 
2,229,537
 
$
2.50
 
Weighted average contractual life and exercise price
The following is the weighted average contractual life in years and the weighted average exercise price at September 30, 2017 of:
 
 
 
 
 
Weighted Average
 
 
 
 
 
 
 
Remaining
 
Weighted Average
 
 
 
Number of Options
 
Contractual Life
 
Exercise Price
 
Options outstanding and vested
 
 
2,229,537
 
1.7 years
 
$
2.50