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SHARE-BASED PAYMENTS (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
.
The fair value of the options granted under the Compensation Plan for the three months ended March 31, 2019 was estimated at the date of grant, using the Black-Scholes Option Valuation Model, with the following weighted-average assumptions:
Risk-free interest rate
2.620
 
Expected life
5.0 years
 
Expected volatility
59.4
*
Expected dividend yield
0.00%
 
Weighted-average expected life of option
5.00
 
Weighted-average grant date fair value
$1.54
 

*
Expected volatility is measured based on the Company’s historical share price volatility over a period equivalent to the expected life of the options.
Schedule of Share-based Compensation, Stock Options, Activity
A summary of the status and activity of non-vested stock options for the three months ended March 31, 2019 is as follows:
 
Number of shares
 
Weighted Average Grant- Date Fair Value
Non-vested December 31, 2018
297,044

 
$
1.06

 Granted
354,844

 
1.54

 Vested
(363,016
)
 
1.31

 Forfeited
—

 
—

Non-vested March 31, 2019
288,872

 
$
1.33

The summary of the Company’s stock options at March 31, 2019 and December 31, 2018, and the changes for the fiscal periods ending on those dates is presented below:
 
Range of Exercise Prices
 
Weighted Average
Exercise Price
 
Number of
Options 
Balance, December 31, 2017
 $1.77 - $15.61

 
$
4.48

 
2,028,847

 Granted
 1.70 - 2.88

 
1.75

 
442,956

 Exercised
1.70 - 2.55

 
2.15

 
(355,092
)
 Forfeited
1.70 - 6.63

 
3.96

 
(213,393
)
 Expired
5.86 - 10.36

 
8.18

 
(170,564
)
Balance, December 31, 2018
 $1.70 - $15.61

 
$
3.84

 
1,732,754

 Granted
2.92

 
2.92

 
354,844

 Exercised
 1.70 - 2.88

 
2.40

 
(33,906
)
 Forfeited
4.44 - 7.42

 
4.78

 
(227,117
)
 Expired
6.77

 
6.77

 
(141,800
)
Balance, March 31, 2019
 $1.70 - $15.61

 
$
3.32

 
1,684,775
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of the status and activity of non-vested RSUs at March 31, 2019 is as follows:
 
RSU
 
Number of shares
 
Weighted Average Grant- Date Fair Value
Non-vested December 31, 2018
1,580,187

 
$
1.99

 Granted
721,750

 
2.92

 Vested
(839,348
)
 
1.99

 Forfeited
(105,706
)
 
2.24

Non-vested March 31, 2019
1,356,882

 
$
2.47