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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of stock option activity
The following summarizes all stock option activity during the years ended December 31, 2019 and 2018:
In thousands
 
Number of
Shares
 
Weighted-
Average
Exercise Price
 
Weighted- Average
Remaining Contractual
Term (Years)
 
Aggregate
Intrinsic Value (Thousands)
Options outstanding at December 31, 2017
 
308,967

 
$
60.80

 
 
 
 

 
 
 
 
 
 
 
 
 
Granted in 2018
 
14,821

 
7.40

 
 
 
 

Exercised in 2018
 
—

 
—

 
 
 
—

Unvested options forfeited in 2018
 
(61,286
)
 
37.13

 
 
 
 

Vested options expired in 2018
 
(91,133
)
 
68.28

 
 
 
 

Options outstanding at December 31, 2018
 
171,369

 
$
60.66

 
 
 
 

 
 
 
 
 
 
 
 
 
Granted in 2019
 
31,906

 
1.57

 
 
 
 

Exercised in 2019
 
—

 
—

 
 
 
—

Unvested options forfeited in 2019
 
(25,392
)
 
10.00

 
 
 
 

Vested options expired in 2019
 
(51,187
)
 
59.84

 
 
 
 

Options outstanding at December 31, 2019
 
126,696

 
$
57.48

 
5.21
 
—

 
 
 
 
 
 
 
 
 
Vested and expected to vest at December 31, 2019
 
126,696

 
$
57.48

 
5.21
 
—

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2019
 
83,674

 
$
85.45

 
3.08
 
—
Summary of information of stock options outstanding
The following table summarizes information about stock options outstanding at December 31, 2019:
Range of
Exercise Prices
 
Number
Outstanding
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining Life (Years)
 
Number
Exercisable
 
Weighted-Average
Exercise Price
$
1.57

 -
7.40
 
46,727

 
$
3.42

 
9.32
 
3,705

 
$
7.40

$
9.70

 -
72.50
 
4,000

 
72.50

 
2.72
 
4,000

 
72.50

$
76.80

 -
119.00
 
73,569

 
88.86

 
2.87
 
73,569

 
88.86

$
123.10

 -
123.10
 
2,400

 
123.10

 
1.10
 
2,400

 
123.10

 
 
 
 
126,696

 
$
57.48

 
5.21
 
83,674

 
$
85.45
Schedule of weighted-average assumptions used to estimate fair value
 
The fair value of each option grant is estimated on the date of grant using the Black-Scholes Option-Pricing Model based on the following weighted-average assumptions used for grants during 2019 and 2018:
 
 
Year Ended December 31,
 
 
2019
 
2018
Expected term (in years)
 
5.50

 
5.23

Expected stock price volatility
 
40.53
%
 
55.07
%
Risk-free interest rate
 
1.86
%
 
2.96
%
Summary of cash stock appreciation rights
The following summarizes all cash stock appreciation rights during the year ended December 31, 2019:

 
 
Number of
Units
 
Weighted-
Average 
Grant Price
 
Weighted-Average
Remaining
Contractual Term
(Years)
Cash stock appreciation rights outstanding at December 31, 2017
 
86,618


$
9.70


9.48
 
 
 
 
 
 
 
Granted in 2018
 
—


—

 
 
Exercised in 2018
 
—


—

 
 
Expired in 2018

(11,090
)

9.70

 
 
Forfeited in 2018
 
(62,852
)

9.70

 
 
Cash stock appreciation rights outstanding at December 31, 2018
 
12,676

 
$
9.70

 
8.48
 
 
 
 
 
 
 
Granted in 2019
 
—

 
—

 
 
Exercised in 2019
 
—

 
—

 
 
Expired in 2018

—

 
—

 
 
Forfeited in 2019
 
—

 
—

 
 
Cash stock appreciation rights outstanding at December 31, 2019
 
12,676

 
$
9.70

 
7.48
 
 
 
 
 
 
 
Vested balance at December 31, 2019
 
6,338


$
9.70


7.48
Summary of restricted stock unit activity
The following summarizes all restricted stock units’ activity during 2019 and 2018:
 
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value
Unvested shares outstanding at December 31, 2017
 
201,222

 
$
15.23

 
 
 
 
 
Granted in 2018
 
72,549

 
9.51

Vested in 2018
 
(56,219
)
 
19.28

Forfeited in 2018
 
(110,137
)
 
14.54

Unvested shares outstanding at December 31, 2018
 
107,415

 
$
9.98

 
 
 
 
 
Granted in 2019
 
383,569

 
3.26

Vested in 2019
 
(39,858
)
 
9.65

Forfeited in 2019
 
(22,835
)
 
10.07

Unvested shares outstanding at December 31, 2019
 
428,291

 
$
3.99
Summary of phantom stock unit activity
The following summarizes all phantom stock unit activity during 2019 and 2018:
 
 
Number of
Units
 
Weighted-
Average Grant
Date Fair Value
Phantom stock units outstanding at December 31, 2017
 
82,037

 
$
15.92

 
 
 
 
 
Granted in 2018
 
—

 
—

Vested in 2018
 
(19,992
)
 
17.85

Forfeited in 2018
 
(29,234
)
 
16.32

Phantom stock units outstanding at December 31, 2018
 
32,811

 
$
14.39

 
 
 
 
 
Granted in 2019
 
—

 
—

Vested in 2019
 
(11,449
)
 
16.01

Forfeited in 2019
 
(6,542
)
 
13.49

Phantom stock units outstanding at December 31, 2019
 
14,820

 
$
13.55
Summary of performance stock unit activity
The following summarizes all performance stock unit activity during 2019 and 2018:
 
 
Number of
Units
 
Weighted-
Average Grant-Date Fair Value
Performance stock units outstanding at December 31, 2017

163,060


$
15.59

 
 
 
 
 
Granted in 2018
 
11,904

 
8.40

Settled in 2018
 
—

 
—

Forfeited in 2018
 
(136,435
)
 
16.40

Performance stock units outstanding at December 31, 2018
 
38,529

 
$
10.50

 
 
 
 
 
Granted in 2019
 
417,035

 
2.67

Settled in 2019
 
—

 
—

Forfeited in 2019
 
(247,635
)
 
3.36

Performance stock units outstanding at December 31, 2019
 
207,929

 
$
3.27
Summary of cash performance unit activity
The following summarizes all performance stock unit activity during 2019 and 2018:
 
 
Number of
Shares
 
Weighted-
Average Grant-Date Fair Value
Cash performance stock units outstanding at December 31, 2017
 
150,506

 
$
14.63

 
 
 
 
 
Granted in 2018
 
—


—

Settled in 2018
 
—


—

Forfeited in 2018
 
(146,728
)

14.32

Cash performance stock units outstanding at December 31, 2018
 
3,778

 
$
26.90

 
 
 
 
 
Granted in 2019
 
—

 
—

Settled in 2019
 
—

 
—

Forfeited in 2019
 
(3,778
)
 
26.90

Cash performance stock units outstanding at December 31, 2019
 
—

 
$
—