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Significant Stock-Based Plan Activity and Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Information Regarding Stock-Based Compensation Expense
Stock-Based Compensation
Certain information regarding our stock-based compensation was as follows (in thousands, except per share amounts):
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Weighted average per share fair value of stock options granted
 
$
—

 
$
4.06

 
$
7.68

Intrinsic value of stock options exercised
 
265

 
223

 
92

Intrinsic value of fully-vested stock awards granted
 
1,812

 
944

 
42
Stock-Based Compensation Expense
Stock-based compensation expense was recognized in our Consolidated Statements of Operations as follows (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Selling, general and administrative expense
$
1,197

 
$
1,005

 
$
1,074

Cost of sales
119

 
82

 
83

Total stock-based compensation expense
$
1,316

 
$
1,087

 
$
1,157
Weighted Average Assumptions Utilized in Determining Fair Value
The following weighted average assumptions were utilized in determining fair value pursuant to the Black-Scholes option pricing model:
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Risk-free interest rate
 
—
%
 
1.66
%
 
1.87
%
Dividend yield
 
—
%
 
—
%
 
—
%
Expected life
 
—

 
6.81 years

 
6.72 years

Volatility
 
—
%
 
51.70
%
 
61.50
%
Stock Option Activity
Stock Option Activity
Stock option activity for the year ended December 31, 2017 was as follows:
 
 
Options Outstanding
 
Weighted Average Exercise Price
Outstanding at December 31, 2016
 
440,247

 
$
9.83

Granted
 
—

 
—

Exercised
 
(30,826
)
 
9.84

Canceled
 
(49,708
)
 
9.42

Outstanding at December 31, 2017
 
359,713

 
9.88
Information Regarding Options Outstanding
Certain information regarding options outstanding as of December 31, 2017 was as follows:
 
 
Options
Outstanding
 
Options
Exercisable
Number
 
359,713

 
195,059

Weighted average exercise price
 
$
9.88

 
$
9.91

Aggregate intrinsic value
 
$
3,351,000

 
$
1,812,000

Weighted average remaining contractual term
 
6.7 years

 
6.1 years
Performance-based Stock Award Activity
Cumulative activity related to performance-based awards during the year ended December 31, 2017 was as follows (in shares):
 
 
Awards Expected to Vest
 
Weighted Average Grant Date Fair Value Per Share
Awards expected to vest as of January 1, 2017
 
189,703

 
$
9.61

Granted (target amount)
 
61,218

 
15.85

Not expected to vest due to failure to meet performance goals
 
(67,200
)
 
13.10

Awards expected to vest as of December 31, 2017
 
183,721

 
10.41