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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted-average assumptions
The assumptions used to compute the fair value of options for the years ending December 31, 2018, 2017 and 2016 were:
 
2018
 
2017
 
2016
Expected volatility
71.0
%
 
73.2
%
 
68.1
%
Risk-free interest rate
2.71
%
 
2.04
%
 
1.98
%
Expected life of options
6.0 years

 
5.7 years

 
4.8 years

Dividend rate
—

 
—

 
—
Stock option activity
A summary of stock option activity for the 2008 Plan and the 2018 Plan through December 31, 2018 was as follows:
 
Options
 
Weighted
Average
Exercise Price
 
Aggregate
Intrinsic Value
(thousands)
 
Weighted Average
Remaining
Contractual Life
Balance at December 31, 2017
4,398,200

 
$
3.98

 
$
2,639

 
5.5 years
Granted
1,047,642

 
$
2.61

 
$
990

 
 
Exercised
(427,977
)
 
$
2.14

 
$
382

 
 
Forfeited and expired
(1,320,140
)
 
$
4.78

 
$
904

 
 
Balance at December 31, 2018
3,697,725

 
$
3.52

 
$
3,974

 
5.9 years
Exercisable at December 31, 2018
2,132,090

 
$
4.46

 
$
1,875

 
4.1 years
Outstanding and exercisable stock options
The following table outlines our outstanding and exercisable stock options as of December 31, 2018:
 
 
Options Outstanding
 
Options Exercisable
Range of Option Exercise Price
 
Outstanding Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life
 
Options Exercisable
 
Weighted Average Exercise Price
$0.00 - $2.06
 
921,094

 
$
1.35

 
6.4 years
 
471,139

 
$
0.76

$2.06 - $4.13
 
1,812,798

 
$
2.50

 
7.2 years
 
697,118

 
$
1.90

$4.13 - $6.19
 
179,000

 
$
5.13

 
3.0 years
 
179,000

 
$
2.74

$6.19 - $8.25
 
633,333

 
$
7.16

 
2.8 years
 
633,333

 
$
4.15

$10.31 - $12.38
 
125,000

 
$
11.04

 
2.6 years
 
125,000

 
$
5.97

$12.38 - $14.44
 
21,500

 
$
14.06

 
4.3 years
 
21,500

 
$
7.30

$16.50 - $18.57
 
5,000

 
$
16.63

 
4.6 years
 
5,000

 
$
8.96

All options
 
3,697,725

 


 

 
2,132,090

 
Restricted stock award activity
A summary of restricted stock award activity through December 31, 2018 was as follows:
 
Restricted
Stock
 
Weighted Average
Grant
Date Fair Value
Balance at December 31, 2017
1,882,363

 
$
1.82

Granted
3,284,197

 
$
2.55

Awards Vested
(372,116
)
 
$
2.09

Canceled
(392,256
)
 
$
2.29

Balance at December 31, 2018
4,402,188

 
$
1.87