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Stock-Based Compensation (Tables)
 12 Months Ended
Jan. 01, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Valuation Assumptions The weighted-average assumptions used in the model were as follows:
 
 
2018
 
2017
 
2016
Risk-free interest rate
 
2.7
%
 
2.0
%
 
1.2
%
Expected term (average in years)
 
6.2

 
6.1

 
5.0

Expected dividend yield
 
—

 
—

 
—

Expected volatility
 
51.0
%
 
39.6
%
 
37.0
%
Weighted-average Black-Scholes fair value per share at date of grant
 
$
5.11

 
$
1.74

 
$
2.85
Schedule of Share-based Compensation, Stock Options, Activity A summary of aggregate option award activity under the Plan as of January 1, 2019, and changes during the fiscal year then ended is presented below:
 
 
Awards
 
Weighted-
Average
Exercise Price
 
Weighted-Average Remaining Contractual Term
 
Aggregate
Intrinsic Value (1)
(in thousands)
Outstanding—January 2, 2018
 
1,332,135

 
$
12.23

 
 
 
 
Granted
 
201,653

 
9.58

 
 
 
 
Forfeited or expired
 
(231,743
)
 
14.09

 
 
 
 
Exercised
 
(127,789
)
 
8.86

 
 
 
 
Outstanding—January 1, 2019
 
1,174,256

 
$
11.78

 
6.46
 
$
667

Vested and expected to vest
 
1,155,755

 
$
11.79

 
6.43
 
$
662

Exercisable as of January 1, 2019
 
713,021

 
$
13.91

 
5.14
 
$
163

_____________
(1)
Aggregate intrinsic value represents the amount by which fair value of the Company’s stock exceeds the exercise price of the option as of January 1, 2019.A summary of the status of the Company’s non-vested restricted share units as of January 1, 2019 and changes during the year then ended is presented below:
 
 
Awards
 
Weighted-
Average
Grant Date Fair Value
Outstanding—January 2, 2018
 
328,359

 
$
4.52

Granted
 
824,251

 
8.51

Vested
 
(197,384
)
 
6.84

Forfeited
 
(47,144
)
 
0.01

Non-vested at January 1, 2019
 
908,082

 
$
0.01