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Stock and Stock Options (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock Option Activity Under the Stock Option Plans
The following tables summarize stock option activity under the Plans: 
 
Shares
 
Price Per Share
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (in
years)
 
Aggregate
Intrinsic
Value (in
millions)
Outstanding, December 31, 2018
1,264,394

 
$1.46 - $14.66
 
$
7.41

 
 
 
 
Granted
323,500

 
$3.31 - $6.26
 
$
4.84

 
 
 
 
Exercised
(9,500
)
 
$1.46
 
$
1.46

 
 
 
 
Canceled
(199,844
)
 
$1.46 - $14.66
 
$
8.77

 
 
 
 
Outstanding, December 31, 2019
1,378,550

 
$2.39 - $14.66
 
$
6.65

 
 
 
 
Exercisable, December 31, 2019
907,667

 
$2.39 - $14.66
 
$
7.21

 
4.4
 
$
—

Exercisable and expected to vest, December 31, 2019
1,314,500

 
$2.39 - $14.66
 
$
6.69

 
5.9
 
$
—
Schedule of Expected Life of the Stock Based Award and Stock Price Volatility
The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions used for grants of options under the Plans:
 
Year Ended
December 31,
 
2019
 
2018
Expected dividend yield
—
 
—
Expected stock price volatility
40% - 43%
 
40% - 45%
Risk-free interest rate
1.6% - 2.6%
 
2.6% - 3.1%
Expected life of options (years)
6
 
6
Service-Based Restricted Stock and Restricted Stock Unit Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Restricted Stock and Unit Award Activity
The following table summarizes the service-based restricted stock and unit award activity for the year ended December 31, 2019:
 
Shares
 
Weighted
Average
Grant Date
Fair Value per Share
Unvested restricted stock at December 31, 2018
130,284

 
$
8.13

Granted
143,719

 
$
3.98

Vested
(126,786
)
 
$
6.43

Canceled
(18,075
)
 
$
7.87

Unvested restricted stock at December 31, 2019
129,142

 
$
5.22
Performance-Based Restricted Stock and Unit Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Restricted Stock and Unit Award Activity
The following table summarizes the performance-based restricted stock and unit award activity for the year ended December 31, 2019:  
 
Shares
 
Weighted
Average
Grant Date
Fair Value per Share
Unvested restricted stock at December 31, 2018
53,835

 
$
8.28

Granted
169,781

 
$
2.41

Vested
(135,803
)
 
$
3.50

Canceled
(73,482
)
 
$
3.39

Unvested restricted stock at December 31, 2019
14,331

 
$
8.95
Market-Based Restricted Stock and Unit Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Restricted Stock and Unit Award Activity
The following table summarized the market-based restricted stock and unit award activity for the year ended December 31, 2019:  
 
Shares
 
Weighted
Average
Grant Date
Fair Value per Share
Unvested restricted stock at December 31, 2018
272,208

 
$
6.16

Granted
—

 
$
—

Vested
—

 
$
—

Canceled
(195,121
)
 
$
5.99

Unvested restricted stock at December 31, 2019
77,087

 
$
6.59
Summary of Market-Based Restricted Stock and Unit Award Grant Estimated Under the Plans
The fair value of each market-based restricted stock and unit award grant is estimated on the date of grant using a Monte-Carlo simulation with the following assumptions used for grants under the Plans:
 
Year Ended
December 31,
 
2018
Expected dividend yield
—
Expected stock price volatility
41.6%
Risk-free interest rate
2.4%
Expected term (years)
3
Weighted average grant date fair value
$8.85
DSU Award  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Restricted Stock and Unit Award Activity
The following table summarizes the DSU activity for the year ended December 31, 2019:
 
Shares
 
Weighted
Average
Grant Date
Fair Value per Share
Unvested deferred stock at December 31, 2018
251,996

 
$
9.33

Granted
199,993

 
$
3.75

Vested
—

 
$
—

Unvested deferred stock at December 31, 2019
451,989

 
$
6.86