Common Stock and Stockholders’ Equity (Deficit) (Details) (Weighted Average Valuation Assumptions for Stock Options) - Stock Options |
12 Months Ended | ||
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Dec. 31, 2016 |
Dec. 26, 2015 |
Dec. 27, 2014 |
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| Stock Options, Valuation Assumptions [Line Items] | |||
| Expected volatility | 62.33% | 60.14% | 53.36% |
| Risk-free interest rate | 1.02% | 1.29% | 1.15% |
| Expected dividends | 0.00% | 0.00% | 0.00% |
| Expected life | 3 years 11 months 23 days | 3 years 10 months 27 days | 3 years 10 months 10 days |
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- Definition Disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. No definition available.
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Weighted average expected volatility rate of share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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