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Stockholders' Equity (Tables) | 12 Months Ended
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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.

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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