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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock option activity
The following summarizes all stock option activity during the years ended December 31, 2018 and 2017:
In thousands
 
Number of
Shares
 
Weighted-
Average
Exercise Price
 
Weighted- Average
Remaining Contractual
Term (Years)
 
Aggregate
Intrinsic Value (Thousands)
Options outstanding at December 31, 2016
 
370,547

 
$
77.23

 
 
 
 

 
 
 
 
 
 
 
 
 
Granted in 2017
 
33,855

 
10.00

 
 
 
 

Exercised in 2017
 
—

 
—

 
 
 
—

Unvested options forfeited in 2017
 
(9,872
)
 
73.31

 
 
 
 

Vested options expired in 2017
 
(85,563
)
 
110.44

 
 
 
 

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

 
4.56
 
—

 
 
 
 
 
 
 
 
 
Vested and expected to vest at December 31, 2018
 
171,369

 
$
60.66

 
4.56
 
—

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2018
 
128,105

 
$
76.48

 
3.13
 
—
Summary of information of stock options outstanding
The following table summarizes information about stock options outstanding at December 31, 2018:
Range of
Exercise Prices
 
Number
Outstanding
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining Life (Years)
 
Number
Exercisable
 
Weighted-Average
Exercise Price
$
7.40

 -
60.40
 
84,502

 
$
30.91

 
5.31
 
44,289

 
$
50.77

$
72.50

 -
119.00
 
84,467

 
88.65

 
3.88
 
81,416

 
89.10

$
123.10

 -
123.10
 
2,400

 
123.10

 
2.10
 
2,400

 
123.10

 
 
 
 
171,369

 
$
60.66

 
4.56
 
128,105

 
$
76.48
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 2018 and 2017:
 
 
Year Ended December 31,
 
 
2018
 
2017
Expected term (in years)
 
5.23

 
6.25

Expected stock price volatility
 
55.07
%
 
53.70
%
Risk-free interest rate
 
2.96
%
 
2.16
%
Summary of cash stock appreciation rights
The following summarizes all cash stock appreciation rights during the year ended December 31, 2018:

 
 
Number of
Units
 
Weighted-
Average 
Grant Price
 
Weighted-Average
Remaining
Contractual Term
(Years)
Cash stock appreciation rights outstanding at December 31, 2016
 
—

 
$
—

 
 
 
 
 
 
 
 
 
Granted in 2017
 
86,618

 
9.70

 
 
Exercised in 2017
 
—

 
—

 
 
Forfeited in 2017
 
—

 
—

 
 
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
 
 
 
 
 
 
 
Vested balance at December 31, 2018
 
3,169

 
$
9.70

 
8.48
Summary of restricted stock unit activity
The following summarizes all restricted stock units' activity during 2018 and 2017:
 
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value
Unvested shares outstanding at December 31, 2016
 
94,543

 
$
37.59

 
 
 
 
 
Granted in 2017
 
160,962

 
9.81

Vested in 2017
 
(40,979
)
 
41.39

Forfeited in 2017
 
(13,304
)
 
27.84

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
Summary of phantom stock unit activity
The following summarizes all phantom stock unit activity during 2018 and 2017:
 
 
Number of
Units
 
Weighted-
Average Grant
Date Fair Value
Phantom stock units outstanding at December 31, 2016
 
53,164

 
$
26.90

 
 
 
 
 
Granted in 2017
 
56,000

 
9.70

Vested in 2017
 
(12,483
)
 
26.90

Forfeited in 2017
 
(14,644
)
 
22.63

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
Summary of performance stock unit activity
The following summarizes all performance stock unit activity during 2018 and 2017:
 
 
Number of
Units
 
Weighted-
Average Grant-Date Fair Value
Performance stock units outstanding at December 31, 2016
 
84,430

 
$
25.56

 
 
 
 
 
Granted in 2017
 
89,124

 
9.95

Settled in 2017
 
—

 
—

Forfeited in 2017
 
(10,494
)
 
47.90

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
Summary of cash performance unit activity
The following summarizes all performance stock unit activity during 2018 and 2017:
 
 
Number of
Shares
 
Weighted-
Average Grant-Date Fair Value
Cash performance stock units outstanding at December 31, 2016
 
44,397

 
$
26.90

 
 
 
 
 
Granted in 2017
 
109,887

 
10.10

Settled in 2017
 
—

 
—

Forfeited in 2017
 
(3,778
)
 
26.90

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