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Stockholders' Equity - Grants and Exercises Under Option Plans (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Weighted average grant date fair value of options granted (in dollars per share) | $ 6.39 | $ 3.36 | $ 3.31
Total intrinsic value of options exercised | $ 67,100 | $ 0 | $ 0

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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