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Stock-Based Compensation - Schedule of non-vested RSU activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares			12 Months Ended
	Sep. 03, 2019	Apr. 01, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Non-vested, beginning of year			413,013
Granted			647,565
Vested			(361,579)
Forfeited			(51,700)
Non-vested, end of year			647,299	413,013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested, beginning of year			$ 5.64
Granted	$ 1.18	$ 1.68	3.20	$ 3.33	$ 7.65
Vested			5.50
Forfeited			4.28
Non-vested, end of year			$ 3.39	$ 5.64

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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X

- Definition

Number of non-vested options outstanding.

+ References

No definition available.

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Number of non-vested options forfeited.

+ References

No definition available.

+ Details

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

+ References

No definition available.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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- Definition

Number of options vested.

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- Definition

Weighted average grant-date fair value of options vested.

+ References

No definition available.

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