Stockholders' Equity - Estimated Fair Value of ESPP Shares (Details) - $ / shares	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life	6 months	6 months	6 months
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	70.00%	48.00%	47.00%
Risk-free interest rate	1.76%	1.90%	0.81%
Estimated fair value, (in usd per share)	$ 1.64	$ 2.47	$ 2.44
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	72.00%	62.00%	51.00%
Risk-free interest rate	2.48%	2.31%	1.16%
Estimated fair value, (in usd per share)	$ 1.77	$ 3.13	$ 3.46

Share Based Compensation Arrangement by Share Based Payment Award Estimated Fair Value of Common Stock per Share

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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