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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 30, 2018
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:
| 2018 |  | 2017 |  | 2016
Stock Options |  |  |  |  |
Expected life | 10.0 |  | 10.0 |  | 10.0
Risk-free interest rate(1) | 2.9% - 3.2% |  | 2.2% - 2.5% |  | 1.8% - 2.4%
Volatility(2) | 52.9% - 53.4% |  | 53.8% - 55.0% |  | 55.2% - 55.8%
Forfeiture rate(3) | 5.1% |  | 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 2018, 2017, and 2016, 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 30, 2018, and changes in options outstanding under the plan for the year ended December 30, 2018, 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 31, 2017 |  | 899 |  |  | $ | 7.82 |  |  | 4.4 |  | $ | 4,224.8 |
Granted |  | 5 |  |  | $ | 11.78 |  |  |  |  |
Exercised |  | (10 | ) |  | $ | 8.71 |  |  |  |  |
Forfeited or expired |  | (126 | ) |  | $ | 24.01 |  |  |  |  |
Options outstanding at December 30, 2018 |  | 768 |  |  | $ | 5.17 |  |  | 4.2 |  | 6,587.5 |
Options exercisable at December 30, 2018 |  | 767 |  |  | $ | 5.16 |  |  | 4.1 |  | $ | 6,586.5 |
Grants and Exercises Under the Company's Option Plans | During the years ended December 30, 2018, December 31, 2017, and December 25, 2016, the following values relate to the grants and exercises under the Company’s option plans:
| 2018 |  | 2017 |  | 2016
Weighted average grant date fair value of options granted | $ | 7.54 |  |  | $ | 6.39 |  |  | $ | 3.36 |
Total intrinsic value of options exercised (in thousands) | $ | 40.6 |  |  | $ | 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 31, 2017 |  | 2,258 |  |  | $ | 6.83 |
Grants |  | 1,119 |  |  | $ | 11.08 |
Vested |  | (84 | ) |  | $ | 9.03 |
Forfeitures |  | — |  |  | $ | — |
Vested but not released |  | — |  |  | $ | — |
Nonvested balance at December 30, 2018 |  | 3,293 |  |  | $ | 8.22 |
Assumptions and Resulting Fair Values of Options Granted | The assumptions and resulting fair values of options granted for 2018, 2017 and 2016 were as follows:
| Offering Periods January 1 to December 31 2018 |  | Offering Periods January 1 to December 31, 2017 |  | Offering Periods January 1 to December 31, 2016
Expected term (in years)(1) | 0.5 |  | 0.5 |  | 0.5
Risk-free interest rate(2) | 1.53% - 2.11% |  | 0.62% - 1.14% |  | 0.36% - 0.49%
Expected volatility(3) | 40.24% - 44.83% |  | 44.38% - 53.70% |  | 53.00% - 55.55%
Expected dividend yield(4) | —% |  | —% |  | —%
Weighted average grant-date fair value per share | $3.03 |  | $2.51 |  | $1.23
(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.

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