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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 27, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Changes in Stock Options
Changes in stock options for the years ended December 27, 2017 and December 28, 2016, are as follows:
 
Shares
 
Weighted-Average
Exercise Price
Outstanding - December 30, 2015
2,151,214

 
$
6.25

Grants
347,053

 
12.14

Exercised
(147,726
)
 
6.62

Forfeited, cancelled or expired
(158,813
)
 
8.20

Outstanding - December 28, 2016
2,191,728

 
7.26

Grants
135,036

 
13.73

Exercised
(17,661
)
 
5.26

Forfeited, cancelled or expired
—

 
—

Outstanding - December 27, 2017
2,309,103

 
$
7.65

Vested and expected to vest at December 27, 2017
2,289,313

 
$
7.60

Exercisable at December 27, 2017
1,909,440

 
$
6.59
Stock Options By Range of Exercise Prices
Stock options at December 27, 2017 are summarized as follows:
Range of Exercise Prices
 
Number
Outstanding
 
Weighted-Average
Remaining
Contractual Life
(in Years)
 
Weighted-
Average Exercise
Price
 
Number
Exercisable
 
Weighted-Average
Exercise Price
$4.09
 
105,418

 
5.48
 
$
4.09

 
105,418

 
$
4.09

$5.84
 
1,599,944

 
4.49
 
5.84

 
1,599,944

 
$
5.84

$9.65 - $13.95
 
464,709

 
8.68
 
12.49

 
82,424

 
$
11.99

$15.00
 
139,032

 
6.58
 
15.00

 
121,654

 
$
15.00

$4.09 - $15.00
 
2,309,103

 
5.51
 
$
7.65

 
1,909,440

 
$
6.59
Schedule of Changes in Restricted Shares
Changes in restricted shares for the years ended December 27, 2017 and December 28, 2016, are as follows:
 
Shares
 
Weighted-Average
Fair Value
Unvested shares at December 30, 2015
12,352

 
$
24.58

Granted
29,259

 
$
13.33

Released
(4,859
)
 
$
26.10

Forfeited, cancelled, or expired
—

 
$
—

Unvested shares at December 28, 2016
36,752

 
$
15.42

Granted
181,292

 
$
13.69

Released
(10,527
)
 
$
16.48

Forfeited, cancelled, or expired
(10,875
)
 
$
16.72

Unvested shares at December 27, 2017
196,642

 
$
13.70