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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014 were:
 
2016
 
2015
 
2014
Expected volatility
68.1
%
 
62.3
%
 
61.0
%
Risk-free interest rate
1.98
%
 
2.20
%
 
2.50
%
Expected life of options
4.8 years

 
8.9 years

 
5.7 years

Dividend rate
—

 
—

 
—
Stock option activity
A summary of stock option activity for the Equity Compensation Plans through December 31, 2016 was as follows:
 
Options
 
Weighted
Average
Exercise Price
 
Aggregate
Intrinsic Value
(thousands)
 
Weighted Average
Remaining
Contractual Life
Balance at December 31, 2015
6,635,597

 
$
6.46

 
$
1.6

 
5.8 years
Granted
562,810

 
$
1.26

 
$
—

 
 
Exercised
—

 
$
—

 
$
—

 
 
Forfeited and expired
(1,933,037
)
 
$
6.79

 
$
—

 
 
Balance at December 31, 2016
5,265,370

 
$
5.78

 
$
—

 
4.4 years
Outstanding options less expected forfeitures at December 31, 2016
5,132,477

 
$
5.85

 
$
—

 
4.3 years
Exercisable at December 31, 2016
4,035,588

 
$
6.68

 
$
—

 
3.3 years
Outstanding and exercisable stock options
The following table outlines our outstanding and exercisable stock options as of December 31, 2016:
 
 
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
 
552,810

 
$
1.19

 
6.0 years
 
110,000

 
$
1.53

$2.06 - $4.13
 
1,350,984

 
$
2.67

 
5.8 years
 
801,680

 
$
2.73

$4.13 - $6.19
 
572,000

 
$
4.84

 
4.7 years
 
464,334

 
$
4.75

$6.19 - $8.25
 
1,898,576

 
$
7.06

 
3.4 years
 
1,768,574

 
$
7.01

$8.25 - $10.32
 
252,500

 
$
9.09

 
1.0 year
 
252,500

 
$
9.09

$10.32 - $12.38
 
305,000

 
$
11.04

 
5.0 years
 
305,000

 
$
11.04

$12.38 - $14.41
 
325,500

 
$
12.92

 
2.9 years
 
325,500

 
$
12.92

$16.50 - $18.57
 
8,000

 
$
16.63

 
6.6 years
 
8,000

 
$
16.63

All options
 
5,265,370

 
$
5.78

 
4.4 years
 
4,035,588

 
$
6.68
Restricted stock award activity
A summary of restricted stock award activity through December 31, 2016 was as follows:
 
Restricted
Stock
 
Weighted Average
Grant
Date Fair Value
 
Weighted Average
Remaining
Recognition Period
Balance at December 31, 2015
49,998

 
$
11.89

 
2.2 years
Granted
575,858

 
$
1.63

 
 
Awards Vested
(78,500
)
 
$
2.59

 
 
Canceled
—

 
$
—

 
 
Balance at December 31, 2016
547,356

 
$
2.43

 
2.2 years
SAR activity
A summary of SAR activity through December 31, 2016 was as follows:
 
Stock Appreciation Rights
 
Weighted
Average
Exercise Price
 
Weighted Average
Remaining
Recognition Period
Balance at December 31, 2015
300,000

 
$
6.48

 
0.0 years
Granted
—

 
$
—

 

Exercised
—

 
$
—

 

Canceled
—

 
$
—

 

Balance at December 31, 2016
300,000

 
$
6.48

 
0.0 years