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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The following table summarizes the stock-based compensation expense recognized, by award type, and the compensation expense (benefit) recognized for phantom stock unit awards during the years ended December 31, 2019 and 2018 (amounts in thousands):
 
Year ended December 31,
 
2019
 
2018
Stock option awards
$
137

 
$
443

Restricted stock awards
504

 
460

Restricted stock unit awards
2,129

 
3,540

 
$
2,770

 
$
4,443

 
 
 
 
Phantom stock unit awards
$
(112
)
 
$
47
Schedule of Share-based Compensation, Restricted Stock Awards, Grants in Period Fair Value and Vests in Period Intrinsic Value [Table Text Block]
The following table presents the weighted-average grant-date fair value per share of restricted stock awards granted and the aggregate fair value of restricted stock awards vested during the years ended December 31, 2019 and 2018:
 
Year ended December 31,
 
2019
 
2018
Grant-date fair value of awards granted (per share)
$
0.73

 
$
5.85

Aggregate fair value of awards vested (in thousands)
$
62

 
$
979
Schedule of Share-based Compensation, Restricted Stock Units Award Activity, Weighted Average Grant Date and Vested in Period, Fair Value [Table Text Block]
The following table presents the weighted-average grant-date fair value per share of restricted stock units granted and the aggregate intrinsic value of restricted stock units vested (converted) during the years ended December 31, 2019 and 2018:
 
Year ended December 31,
 
2019
 
2018
Time-based RSUs:
 
 
 
Grant-date fair value of awards granted (per share)
$
1.38

 
$
3.85

Aggregate intrinsic value of awards vested (in thousands)
$
498

 
$
424

Performance-based RSUs:
 
 
 
Aggregate intrinsic value of awards vested (in thousands)
$
—

 
$
1,547
Schedule of Share-based Compensation, Phantom Stock Unit Award Activity [Table Text Block]
The following table summarizes the number, weighted-average grant-date fair value, and applicable maximum cash value of the phantom stock unit awards granted during the year ended December 31, 2019 and 2018:
 
Year ended December 31,
 
2019
 
2018
Performance-based:
 
 
 
Phantom stock unit awards granted
2,467,776

 
1,188,216

Weighted-average grant-date fair value (per unit)
$
1.10

 
$
3.06

Maximum cash value per unit (three times the grant date stock price)
$
4.62

 
$
9.66

Time-based:
 
 
 
Phantom stock unit awards granted
810,648

 
—

Weighted-average grant-date fair value (per unit)
$
1.17

 
$
—

Maximum cash value per unit (three times the grant date stock price)
$
4.62

 
$
—
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
The following table summarizes our stock option activity from December 31, 2018 through December 31, 2019:
 
Number of
Shares
 
Weighted-Average
Exercise Price
Per Share
 
Weighted-Average
Remaining 
Contract Term in Years
 
Aggregate Intrinsic Value (in thousands)(1)
Outstanding stock options as of December 31, 2018
3,739,910
 
$5.56
 
 
 
 
Forfeited
(732,801)
 
4.33
 
 
 
 
Outstanding stock options as of December 31, 2019
3,007,109
 
$5.86
 
3.8
 
$
—

 
 
 
 
 
 
 
 
Stock options exercisable as of December 31, 2019
2,920,219
 
$5.85
 
3.7
 
$
—

 
 
 
 
 
 
 
 
(1) Intrinsic value is the amount by which the market price of our common stock exceeds the exercise price of the stock options.
Schedule of Nonvested Share Activity [Table Text Block]
The following table summarizes our nonvested stock option activity from December 31, 2018 through December 31, 2019:
 
Number of
Shares
 
Weighted-Average Grant-Date
Fair Value Per Share
Nonvested stock options as of December 31, 2018
480,785
 
$2.09
Vested
(391,388)
 
1.59
Forfeited
(2,507)
 
4.30
Nonvested stock options as of December 31, 2019
86,890
 
$4.28
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Share Activity [Table Text Block]
The following table summarizes our restricted stock activity from December 31, 2018 through December 31, 2019:
 
Number of
Shares
 
Weighted-Average
Grant-Date
Fair Value per Share
Nonvested restricted stock as of December 31, 2018
78,632
 
$5.85
Granted
729,112
 
0.73
Vested
(78,632)
 
5.85
Nonvested restricted stock as of December 31, 2019
729,112
 
$0.73
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Share Activity [Table Text Block]
The following table summarizes our restricted stock unit activity from December 31, 2018 through December 31, 2019:
 
Time-Based Award
 
Performance-Based Award
 
Number of
Time-Based
Award Units
 
Weighted-Average
Grant-Date
Fair Value 
per Unit
 
Number of
Performance-Based
Award Units
 
Weighted-Average
Grant-Date
Fair Value 
per Unit
Nonvested restricted stock units as of
December 31, 2018
887,469
 
$3.80
 
563,469

 
$7.73
       Granted
870,648
 
1.38
 
—

 
—

Vested
(346,069)
 
3.58
 
—

 
—

       Forfeited
(53,891)
 
2.48
 
(55,749
)
 
7.75

Nonvested restricted stock units as of
December 31, 2019
1,358,157
 
$2.36
 
507,720

 
$7.73