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STOCKHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2018
Summary of stock warrant activity
A summary of stock warrant activity for the years ended December 31, 2018 and 2017 are presented below:
 
 
 
Number of

Warrants
(in thousands)
 
 
Weighted
Average
Exercise
Price
 
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
 
Aggregate
Intrinsic
Value
(in thousands)
 
Outstanding at December 31, 2016
 
 
52
 
 
$
0.21
 
 
 
 
 
 
$
-
 
Granted
 
 
150
 
 
$
2.42
 
 
 
 
 
 
 
 
 
Exercised
 
 
(2
)
 
$
0.35
 
 
 
 
 
 
 
 
 
Forfeited
 
 
-
 
 
$
-
 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2017
 
 
200
 
 
$
1.86
 
 
 
5.86
 
 
$
264
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2017
 
 
200
 
 
$
1.86
 
 
 
 
 
 
 
 
 
Granted
 
 
-
 
 
 
-
 
 
 
 
 
 
 
 
 
Exercised
 
 
(50
)
 
$
0.20
 
 
 
 
 
 
 
 
 
Forfeited
 
 
-
 
 
$
-
 
 
 
 
 
 
 
 
 
Outstanding and Exercisable at December 31, 2018
 
 
150
 
 
$
2.42
 
 
 
5.77
 
 
$
79
 
Warrant [Member]  
Summary of fair value of common stock warrants
The Company uses the Black Scholes option pricing model to determine the fair value of common stock warrants, using the following assumptions during the years ended December 31, 2018 and 2017:
 
 
 
2018
 
 
2017
 
Weighted average expected term
 
 
-
 
 
 
4.38
years
 
Weighted average volatility
 
 
-
 
 
 
136.62
%
Weighted average risk-free interest rate
 
 
-
 
 
 
1.51
%
Dividend yield
 
 
-
 
 
 
0
%