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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015 were:
 
2017
 
2016
 
2015
Expected volatility
73.2
%
 
68.1
%
 
62.3
%
Risk-free interest rate
2.04
%
 
1.98
%
 
2.20
%
Expected life of options
5.7 years

 
4.8 years

 
8.9 years

Dividend rate
—

 
—

 
—
Stock option activity
A summary of stock option activity for the Equity Compensation Plans through December 31, 2017 was as follows:
 
Options
 
Weighted
Average
Exercise Price
 
Aggregate
Intrinsic Value
(thousands)
 
Weighted Average
Remaining
Contractual Life
Balance at December 31, 2016
5,265,370

 
$
5.78

 
$
—

 
4.4 years
Granted
1,618,092

 
$
1.93

 
$
1,499

 
 
Exercised
(146,667
)
 
$
2.37

 
$
36

 
 
Forfeited and expired
(2,338,595
)
 
$
6.77

 
$
325

 
 
Balance at December 31, 2017
4,398,200

 
$
3.98

 
$
2,639

 
5.5 years
Outstanding options less expected forfeitures at December 31, 2017
4,210,163

 
$
4.07

 
$
2,465

 
5.4 years
Exercisable at December 31, 2017
2,497,766

 
$
5.59

 
$
647

 
3.6 years
Outstanding and exercisable stock options
The following table outlines our outstanding and exercisable stock options as of December 31, 2017:
 
 
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
 
1,253,866

 
$
1.42

 
7.3 years
 
257,604

 
$
1.29

$2.06 - $4.13
 
1,663,258

 
$
2.49

 
6.0 years
 
759,086

 
$
2.71

$4.13 - $6.19
 
210,500

 
$
5.02

 
3.8 years
 
210,500

 
$
5.02

$6.19 - $8.25
 
983,076

 
$
7.20

 
3.5 years
 
983,076

 
$
7.20

$10.31 - $12.38
 
175,000

 
$
11.04

 
2.8 years
 
175,000

 
$
11.04

$12.38 - $14.44
 
104,500

 
$
13.09

 
4.9 years
 
104,500

 
$
13.09

$16.50 - $18.57
 
8,000

 
$
16.63

 
3.6 years
 
8,000

 
$
16.63

All options
 
4,398,200

 


 

 
2,497,766

 
Restricted stock award activity
A summary of restricted stock award activity through December 31, 2017 was as follows:
 
Restricted
Stock
 
Weighted Average
Grant
Date Fair Value
 
Weighted Average
Remaining
Recognition Period
Balance at December 31, 2016
547,356

 
$
2.43

 
2.2 years
Granted
1,563,922

 
$
1.80

 
 
Awards Vested
(145,402
)
 
$
3.71

 
 
Canceled
(83,513
)
 
$
1.83

 
 
Balance at December 31, 2017
1,882,363

 
$
1.82

 
4.0 years
SAR activity
A summary of SAR activity through December 31, 2017 was as follows:
 
Stock Appreciation Rights
 
Weighted
Average
Exercise Price
 
Weighted Average
Remaining
Recognition Period
Balance at December 31, 2016
300,000

 
$
6.48

 
0.0 years
Granted
—

 

 

Exercised
—

 

 

Canceled
(200,000
)
 
$
5.70

 

Balance at December 31, 2017
100,000

 
$
8.05

 
0.0 years