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Warrants
12 Months Ended
Dec. 31, 2016
Stockholders' Equity Note [Abstract]  
Warrants
8.  
Warrants
 
The following table summarizes warrant activity for the years ended December 31, 2016 and 2015:
 
 
 
Year Ended
 
Year Ended
 
 
 
December 31, 2016
 
December 31, 2015
 
 
 
 
 
Wtd. Avg.
 
 
 
Wtd. Avg.
 
 
 
 
 
Exercise
 
 
 
Exercise
 
 
 
Shares
 
Price
 
Shares
 
Price
 
Outstanding at beginning of year
 
 
7,195,997
 
$
4.60
 
 
7,428,141
 
$
4.49
 
Granted
 
 
550,000
 
 
1.75
 
 
––
 
 
––
 
Exercised
 
 
(142,856)
 
 
0.84
 
 
(232,144)
 
 
1.03
 
Forfeited/Expired
 
 
––
 
 
––
 
 
––
 
 
––
 
Outstanding and exercisable at end of year
 
 
7,603,141
 
$
4.46
 
 
7,195,997
 
$
4.60
 
 
On May 12, 2016, we issued 550,000 warrants with an exercise price of $1.75 and an expiration date of May 12, 2021 in connection with the credit facility agreement. See Note 1 “Organization and Significant Accounting Policies – Recent Developments – Credit Facility” for more information. 
 
The outstanding warrants have expiration dates between May 2017 and May 2021.