Stockholders' Equity and Stock-Based Compensation - Weighted Average Assumptions for Fair Value Stock-Based Awards (Options) (Details)	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Weighted average assumptions for fair value estimate of stock-based awards (options)
Average risk free interest rate	0.22%	1.58%	0.25%	1.75%
Expected life (in years)	4 years 6 months 18 days	4 years 6 months 18 days	4 years 6 months 18 days	4 years 6 months 18 days
Average volatility	63.00%	48.00%	62.00%	45.00%

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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