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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Valuation Assumptions
Awards with graded vesting are recognized using the straight-line method with the following assumptions:

 
2017
 
2016
 
2015
Stock Options
 
 
 
 
 
Expected life
10.0
 
10.0
 
10.0
Risk-free interest rate(1)
2.2% - 2.5%
 
1.8% - 2.4%
 
2.1% - 2.3%
Volatility(2)
53.8% - 55.0%
 
55.2% - 55.8%
 
54.4% - 54.7%
Forfeiture rate(3)
5.0%
 
5.0%
 
5.0%
Dividend yield(4)
—%
 
—%
 
—%


(1) The risk-free interest rate is based on U.S. Treasury yields in effect at the time of grant with a term equal to the expected term of the options.
(2) In 2017, 2016, and 2015, the Company estimated implied volatility based upon trailing volatility.
(3) Forfeitures are estimated at the time of grant based upon historical information. Forfeitures will be revised, if necessary, in subsequent periods if actual forfeitures differ from estimates.
(4) The Company has no history or expectation of paying dividends on its common stock.
Stock Options Roll Forward
A summary of the status of the Company’s stock option plan as of December 31, 2017, and changes in options outstanding under the plan for the year ended December 31, 2017, is as follows:

 
 
Number of
Shares Under Option
 
Weighted-Average Exercise Price per Share
 
Weighted-
Average
Remaining
Contractual
Term
(in years)
 
Aggregate Intrinsic Value
 
 
(000’s)
 
 
 
 
 
(000’s)
Options outstanding at December 25, 2016
 
963

 
$
8.05

 
5.2
 
$
1,924.1

Granted
 
7

 
$
9.78

 
 
 
 
Exercised
 
(49
)
 
$
8.85

 
 
 
 
Forfeited or expired
 
(22
)
 
$
16.40

 
 
 
 
Options outstanding at December 31, 2017
 
899

 
$
7.82

 
4.4
 
4,224.8

Options exercisable at December 31, 2017
 
322

 
$
12.91

 
3.4
 
$
965.6
Grants and Exercises Under the Company's Option Plans
During the years ended December 31, 2017, December 25, 2016, and December 27, 2015 the following values relate to the grants and exercises under the Company’s option plans:

 
2017
 
2016
 
2015
Weighted average grant date fair value of options granted
$
6.39

 
$
3.36

 
$
3.31

Total intrinsic value of options exercised (in thousands)
$
67.1

 
$
—

 
$
—
Restricted Stock Units Activity
The following table summarizes the Company’s Restricted Stock Unit activity:

 
 
Restricted
Stock Units
(000’s)
 
Weighted-Average Grant Date Fair Value
Nonvested balance at December 25, 2016
 
2,246

 
$
6.81

Grants
 
1,180

 
$
7.45

Vested
 
(841
)
 
$
7.48

Forfeitures
 
(20
)
 
$
7.28

Vested but not released
 
(307
)
 
$
7.24

Nonvested balance at December 31, 2017
 
2,258

 
$
6.83
Assumptions and Resulting Fair Values of Options Granted
The assumptions and resulting fair values of options granted for 2017, 2016 and 2015 were as follows:

 
Offering
Periods
January 1 to
December 31
2017
 
Offering
Periods
January 1 to
December 31,
2016
 
Offering
Periods
January 1 to
December 31,
2015
Expected term (in years)(1)
0.5
 
0.5
 
0.5
Risk-free interest rate(2)
.62% - 1.14%
 
0.36% - 0.49%
 
0.11% - 0.12%
Expected volatility(3)
44.38% - 53.70%
 
53.00% - 55.55%
 
39.63% - 40.91%
Expected dividend yield(4)
—%
 
—%
 
—%
Weighted average grant-date fair value per share
$2.51
 
$1.23
 
$1.43

(1)
The expected term is equivalent to the offering period.
(2)
The risk-free interest rate is based on U.S. Treasury yields in effect at the time of grant with a term equal to the expected term.
(3)    The Company estimated implied volatility based upon trailing volatility.
(4)    The Company has no history or expectation of paying dividends on its common stock.